16403697 has 6 divisors (see below), whose sum is σ = 23694242. Its totient is φ = 10935792.

The previous prime is 16403671. The next prime is 16403747. The reversal of 16403697 is 79630461.

16403697 is a `hidden beast` number, since 1 + 640 + 3 + 6 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15872256 + 531441 = 3984^2 + 729^2 .

It is not a de Polignac number, because 16403697 - 2¹² = 16399601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16403197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 911308 + ... + 911325.

Almost surely, 2^16403697 is an apocalyptic number.

It is an amenable number.

16403697 is a deficient number, since it is larger than the sum of its proper divisors (7290545).

16403697 is a wasteful number, since it uses less digits than its factorization.

16403697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822639 (or 1822636 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 16403697 is about 4050.1477750818. The cubic root of 16403697 is about 254.0859082792.

The spelling of 16403697 in words is "sixteen million, four hundred three thousand, six hundred ninety-seven".