16309690 has 16 divisors (see below), whose sum is σ = 29912328. Its totient is φ = 6400576.

The previous prime is 16309669. The next prime is 16309697. The reversal of 16309690 is 9690361.

It can be written as a sum of positive squares in 4 ways, for example, as 11350161 + 4959529 = 3369^2 + 2227^2 .

It is a super-2 number, since 2×16309690² = 532011975792200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (16309697) 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, 14857 + ... + 15916.

Almost surely, 2^16309690 is an apocalyptic number.

16309690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16309690 is a deficient number, since it is larger than the sum of its proper divisors (13602638).

16309690 is a wasteful number, since it uses less digits than its factorization.

16309690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30833.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 16309690 is about 4038.5257211017. The cubic root of 16309690 is about 253.5996026922.

The spelling of 16309690 in words is "sixteen million, three hundred nine thousand, six hundred ninety".