16403265 has 24 divisors (see below), whose sum is σ = 28716480. Its totient is φ = 8661024.

The previous prime is 16403243. The next prime is 16403269. The reversal of 16403265 is 56230461.

16403265 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16403265 - 2⁹ = 16402753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16403269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2866 + ... + 6404.

It is an arithmetic number, because the mean of its divisors is an integer number (1196520).

Almost surely, 2^16403265 is an apocalyptic number.

16403265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16403265 is a deficient number, since it is larger than the sum of its proper divisors (12313215).

16403265 is a wasteful number, since it uses less digits than its factorization.

16403265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653 (or 3650 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 16403265 is about 4050.0944433433. The cubic root of 16403265 is about 254.0836777642.

The spelling of 16403265 in words is "sixteen million, four hundred three thousand, two hundred sixty-five".