16399477 has 2 divisors, whose sum is σ = 16399478. Its totient is φ = 16399476.

The previous prime is 16399433. The next prime is 16399507. The reversal of 16399477 is 77499361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8814961 + 7584516 = 2969^2 + 2754^2 .

It is a cyclic number.

It is not a de Polignac number, because 16399477 - 2¹⁵ = 16366709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16399777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199738 + 8199739.

It is an arithmetic number, because the mean of its divisors is an integer number (8199739).

Almost surely, 2^16399477 is an apocalyptic number.

It is an amenable number.

16399477 is a deficient number, since it is larger than the sum of its proper divisors (1).

16399477 is an equidigital number, since it uses as much as digits as its factorization.

16399477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 46.

The square root of 16399477 is about 4049.6267729261. The cubic root of 16399477 is about 254.0641177748.

The spelling of 16399477 in words is "sixteen million, three hundred ninety-nine thousand, four hundred seventy-seven".