16391448 has 48 divisors (see below), whose sum is σ = 44870280. Its totient is φ = 5405184.

The previous prime is 16391447. The next prime is 16391449. The reversal of 16391448 is 84419361.

16391448 is a `hidden beast` number, since 1 + 639 + 14 + 4 + 8 = 666.

16391448 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16391447) and next prime (16391449).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16391447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5811 + ... + 8157.

Almost surely, 2^16391448 is an apocalyptic number.

16391448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16391448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22435140).

16391448 is an abundant number, since it is smaller than the sum of its proper divisors (28478832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16391448 is a wasteful number, since it uses less digits than its factorization.

16391448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456 (or 2449 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 16391448 is about 4048.6353256375. The cubic root of 16391448 is about 254.0226486924.

The spelling of 16391448 in words is "sixteen million, three hundred ninety-one thousand, four hundred forty-eight".