213555400 has 24 divisors (see below), whose sum is σ = 496516770. Its totient is φ = 85422080.

The previous prime is 213555371. The next prime is 213555427. The reversal of 213555400 is 4555312.

It can be written as a sum of positive squares in 3 ways, for example, as 122810724 + 90744676 = 11082^2 + 9526^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 533689 + ... + 534088.

Almost surely, 2^213555400 is an apocalyptic number.

213555400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213555400 is an abundant number, since it is smaller than the sum of its proper divisors (282961370).

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

213555400 is a wasteful number, since it uses less digits than its factorization.

213555400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067793 (or 1067784 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 213555400 is about 14613.5348222119. The cubic root of 213555400 is about 597.7278881889.

The spelling of 213555400 in words is "two hundred thirteen million, five hundred fifty-five thousand, four hundred".