213431540 has 48 divisors (see below), whose sum is σ = 526092672. Its totient is φ = 71197056.

The previous prime is 213431539. The next prime is 213431551. The reversal of 213431540 is 45134312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15422 + ... + 25781.

It is an arithmetic number, because the mean of its divisors is an integer number (10960264).

Almost surely, 2^213431540 is an apocalyptic number.

213431540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213431540 is an abundant number, since it is smaller than the sum of its proper divisors (312661132).

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

213431540 is a wasteful number, since it uses less digits than its factorization.

213431540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41256 (or 41254 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 213431540 is about 14609.2963554033. The cubic root of 213431540 is about 597.6123071048.

Adding to 213431540 its reverse (45134312), we get a palindrome (258565852).

The spelling of 213431540 in words is "two hundred thirteen million, four hundred thirty-one thousand, five hundred forty".