212489740 has 24 divisors (see below), whose sum is σ = 449491392. Its totient is φ = 84374400.

The previous prime is 212489737. The next prime is 212489777. The reversal of 212489740 is 47984212.

It is a self number, because there is not a number n which added to its sum of digits gives 212489740.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36036 + ... + 41515.

It is an arithmetic number, because the mean of its divisors is an integer number (18728808).

Almost surely, 2^212489740 is an apocalyptic number.

212489740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212489740 is an abundant number, since it is smaller than the sum of its proper divisors (237001652).

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

212489740 is a wasteful number, since it uses less digits than its factorization.

212489740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77697 (or 77695 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 212489740 is about 14577.0278177686. The cubic root of 212489740 is about 596.7319917796.

The spelling of 212489740 in words is "two hundred twelve million, four hundred eighty-nine thousand, seven hundred forty".