213573440 has 28 divisors (see below), whose sum is σ = 508572516. Its totient is φ = 85429248.

The previous prime is 213573407. The next prime is 213573457. The reversal of 213573440 is 44375312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 82882816 + 130690624 = 9104^2 + 11432^2 .

It is a super-2 number, since 2×213573440² = 91227228546867200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333389 + ... + 334028.

Almost surely, 2^213573440 is an apocalyptic number.

213573440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213573440 is an abundant number, since it is smaller than the sum of its proper divisors (294999076).

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

213573440 is an equidigital number, since it uses as much as digits as its factorization.

213573440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667434 (or 667424 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 213573440 is about 14614.1520451924. The cubic root of 213573440 is about 597.7447186499.

The spelling of 213573440 in words is "two hundred thirteen million, five hundred seventy-three thousand, four hundred forty".