16400275 has 12 divisors (see below), whose sum is σ = 20549032. Its totient is φ = 12983040.

The previous prime is 16400273. The next prime is 16400299. The reversal of 16400275 is 57200461.

It is not a de Polignac number, because 16400275 - 2¹ = 16400273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 957 + ... + 5806.

Almost surely, 2^16400275 is an apocalyptic number.

16400275 is a deficient number, since it is larger than the sum of its proper divisors (4148757).

16400275 is an equidigital number, since it uses as much as digits as its factorization.

16400275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6870 (or 6865 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 16400275 is about 4049.7252993259. The cubic root of 16400275 is about 254.0682386355.

The spelling of 16400275 in words is "sixteen million, four hundred thousand, two hundred seventy-five".