16399657 has 8 divisors (see below), whose sum is σ = 16764992. Its totient is φ = 16038000.

The previous prime is 16399619. The next prime is 16399661. The reversal of 16399657 is 75699361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16399657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16391657) 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, 9307 + ... + 10927.

It is an arithmetic number, because the mean of its divisors is an integer number (2095624).

Almost surely, 2^16399657 is an apocalyptic number.

It is an amenable number.

16399657 is a deficient number, since it is larger than the sum of its proper divisors (365335).

16399657 is a wasteful number, since it uses less digits than its factorization.

16399657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839.

The product of its digits is 306180, while the sum is 46.

The square root of 16399657 is about 4049.6489971354. The cubic root of 16399657 is about 254.0650473040.

The spelling of 16399657 in words is "sixteen million, three hundred ninety-nine thousand, six hundred fifty-seven".