16636440 has 32 divisors (see below), whose sum is σ = 49909680. Its totient is φ = 4436352.

The previous prime is 16636427. The next prime is 16636441. The reversal of 16636440 is 4463661.

It is a super-2 number, since 2×16636440² = 553542271747200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 16636398 and 16636407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16636441) 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, 69199 + ... + 69438.

Almost surely, 2^16636440 is an apocalyptic number.

16636440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16636440 is an abundant number, since it is smaller than the sum of its proper divisors (33273240).

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

16636440 is a wasteful number, since it uses less digits than its factorization.

16636440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138651 (or 138647 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 16636440 is about 4078.7792291322. The cubic root of 16636440 is about 255.2819641532.

The spelling of 16636440 in words is "sixteen million, six hundred thirty-six thousand, four hundred forty".