16398840 has 32 divisors (see below), whose sum is σ = 49196880. Its totient is φ = 4372992.

The previous prime is 16398797. The next prime is 16398841. The reversal of 16398840 is 4889361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16398841) 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, 68209 + ... + 68448.

Almost surely, 2^16398840 is an apocalyptic number.

16398840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16398840 is an abundant number, since it is smaller than the sum of its proper divisors (32798040).

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

16398840 is a wasteful number, since it uses less digits than its factorization.

16398840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136671 (or 136667 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 16398840 is about 4049.5481229392. The cubic root of 16398840 is about 254.0608282200.

The spelling of 16398840 in words is "sixteen million, three hundred ninety-eight thousand, eight hundred forty".