213456404 has 24 divisors (see below), whose sum is σ = 438453120. Its totient is φ = 89008416.

The previous prime is 213456401. The next prime is 213456413. The reversal of 213456404 is 404654312.

It is a super-2 number, since 2×213456404² = 91127272817222432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213456401) 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, 101984 + ... + 104055.

It is an arithmetic number, because the mean of its divisors is an integer number (18268880).

Almost surely, 2^213456404 is an apocalyptic number.

It is an amenable number.

213456404 is an abundant number, since it is smaller than the sum of its proper divisors (224996716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213456404 is a wasteful number, since it uses less digits than its factorization.

213456404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206087 (or 206085 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 213456404 is about 14610.1472956298. The cubic root of 213456404 is about 597.6355127588.

The spelling of 213456404 in words is "two hundred thirteen million, four hundred fifty-six thousand, four hundred four".