16991936 has 42 divisors (see below), whose sum is σ = 36534852. Its totient is φ = 7837440.

The previous prime is 16991927. The next prime is 16991951. The reversal of 16991936 is 63919961.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10031 + ... + 11601.

Almost surely, 2^16991936 is an apocalyptic number.

16991936 is a gapful number since it is divisible by the number (16) 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 16991936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18267426).

16991936 is an abundant number, since it is smaller than the sum of its proper divisors (19542916).

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

16991936 is a wasteful number, since it uses less digits than its factorization.

16991936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 1586 counting only the distinct ones).

The product of its digits is 78732, while the sum is 44.

The square root of 16991936 is about 4122.1276059821. The cubic root of 16991936 is about 257.0874961361.

The spelling of 16991936 in words is "sixteen million, nine hundred ninety-one thousand, nine hundred thirty-six".