213944840 has 16 divisors (see below), whose sum is σ = 481375980. Its totient is φ = 85577920.

The previous prime is 213944833. The next prime is 213944851. The reversal of 213944840 is 48449312.

It can be written as a sum of positive squares in 2 ways, for example, as 213919876 + 24964 = 14626^2 + 158^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 213944840.

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, 2674271 + ... + 2674350.

Almost surely, 2^213944840 is an apocalyptic number.

213944840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213944840 is an abundant number, since it is smaller than the sum of its proper divisors (267431140).

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

213944840 is a wasteful number, since it uses less digits than its factorization.

213944840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5348632 (or 5348628 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 213944840 is about 14626.8533868361. The cubic root of 213944840 is about 598.0910067569.

The spelling of 213944840 in words is "two hundred thirteen million, nine hundred forty-four thousand, eight hundred forty".