16536440 has 16 divisors (see below), whose sum is σ = 37207080. Its totient is φ = 6614560.

The previous prime is 16536439. The next prime is 16536449. The reversal of 16536440 is 4463561.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16536449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206666 + ... + 206745.

Almost surely, 2^16536440 is an apocalyptic number.

16536440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16536440 is an abundant number, since it is smaller than the sum of its proper divisors (20670640).

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

16536440 is a wasteful number, since it uses less digits than its factorization.

16536440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413422 (or 413418 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 16536440 is about 4066.5021824659. The cubic root of 16536440 is about 254.7694443059.

The spelling of 16536440 in words is "sixteen million, five hundred thirty-six thousand, four hundred forty".