16400253 has 8 divisors (see below), whose sum is σ = 22166848. Its totient is φ = 10783584.

The previous prime is 16400233. The next prime is 16400269. The reversal of 16400253 is 35200461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16400253 - 2⁵ = 16400221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37225 + ... + 37662.

It is an arithmetic number, because the mean of its divisors is an integer number (2770856).

Almost surely, 2^16400253 is an apocalyptic number.

It is an amenable number.

16400253 is a deficient number, since it is larger than the sum of its proper divisors (5766595).

16400253 is an equidigital number, since it uses as much as digits as its factorization.

16400253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74963.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 16400253 is about 4049.7225830913. The cubic root of 16400253 is about 254.0681250296.

It can be divided in two parts, 16400 and 253, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 16400253 in words is "sixteen million, four hundred thousand, two hundred fifty-three".