16391636 has 24 divisors (see below), whose sum is σ = 29654016. Its totient is φ = 7922880.

The previous prime is 16391633. The next prime is 16391657. The reversal of 16391636 is 63619361.

It is a junction number, because it is equal to n+sod(n) for n = 16391596 and 16391605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16391633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20435 + ... + 21221.

It is an arithmetic number, because the mean of its divisors is an integer number (1235584).

Almost surely, 2^16391636 is an apocalyptic number.

It is an amenable number.

16391636 is a deficient number, since it is larger than the sum of its proper divisors (13262380).

16391636 is a wasteful number, since it uses less digits than its factorization.

16391636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959 (or 957 counting only the distinct ones).

The product of its digits is 17496, while the sum is 35.

The square root of 16391636 is about 4048.6585432708. The cubic root of 16391636 is about 254.0236198507.

The spelling of 16391636 in words is "sixteen million, three hundred ninety-one thousand, six hundred thirty-six".