16423440 has 80 divisors (see below), whose sum is σ = 55550016. Its totient is φ = 3980800.

The previous prime is 16423439. The next prime is 16423441. The reversal of 16423440 is 4432461.

It is an interprime number because it is at equal distance from previous prime (16423439) and next prime (16423441).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 16423440.

It is not an unprimeable number, because it can be changed into a prime (16423441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471 + ... + 5750.

Almost surely, 2^16423440 is an apocalyptic number.

16423440 is a gapful number since it is divisible by the number (10) 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 16423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27775008).

16423440 is an abundant number, since it is smaller than the sum of its proper divisors (39126576).

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

16423440 is a wasteful number, since it uses less digits than its factorization.

16423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6248 (or 6242 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 16423440 is about 4052.5843606272. The cubic root of 16423440 is about 254.1878041485.

The spelling of 16423440 in words is "sixteen million, four hundred twenty-three thousand, four hundred forty".