16402385 has 4 divisors (see below), whose sum is σ = 19682868. Its totient is φ = 13121904.

The previous prime is 16402369. The next prime is 16402391. The reversal of 16402385 is 58320461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8427409 + 7974976 = 2903^2 + 2824^2 .

It is a cyclic number.

It is not a de Polignac number, because 16402385 - 2⁴ = 16402369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640234 + ... + 1640243.

It is an arithmetic number, because the mean of its divisors is an integer number (4920717).

Almost surely, 2^16402385 is an apocalyptic number.

It is an amenable number.

16402385 is a deficient number, since it is larger than the sum of its proper divisors (3280483).

16402385 is an equidigital number, since it uses as much as digits as its factorization.

16402385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280482.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 16402385 is about 4049.9858024443. The cubic root of 16402385 is about 254.0791340015.

The spelling of 16402385 in words is "sixteen million, four hundred two thousand, three hundred eighty-five".