16399370 has 32 divisors (see below), whose sum is σ = 32130000. Its totient is φ = 5990400.

The previous prime is 16399363. The next prime is 16399393. The reversal of 16399370 is 7399361.

16399370 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 7890481 + 8508889 = 2809^2 + 2917^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12506 + ... + 13754.

Almost surely, 2^16399370 is an apocalyptic number.

16399370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16399370 is a deficient number, since it is larger than the sum of its proper divisors (15730630).

16399370 is a wasteful number, since it uses less digits than its factorization.

16399370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370.

The product of its (nonzero) digits is 30618, while the sum is 38.

The square root of 16399370 is about 4049.6135618106. The cubic root of 16399370 is about 254.0635652182.

Subtracting from 16399370 its reverse (7399361), we obtain a palindrome (9000009).

The spelling of 16399370 in words is "sixteen million, three hundred ninety-nine thousand, three hundred seventy".