213438440 has 16 divisors (see below), whose sum is σ = 480236580. Its totient is φ = 85375360.

The previous prime is 213438427. The next prime is 213438443. The reversal of 213438440 is 44834312.

It can be written as a sum of positive squares in 2 ways, for example, as 211935364 + 1503076 = 14558^2 + 1226^2 .

It is not an unprimeable number, because it can be changed into a prime (213438443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2667941 + ... + 2668020.

Almost surely, 2^213438440 is an apocalyptic number.

213438440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213438440 is an abundant number, since it is smaller than the sum of its proper divisors (266798140).

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

213438440 is a wasteful number, since it uses less digits than its factorization.

213438440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5335972 (or 5335968 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 213438440 is about 14609.5325044986. The cubic root of 213438440 is about 597.6187470784.

The spelling of 213438440 in words is "two hundred thirteen million, four hundred thirty-eight thousand, four hundred forty".