212990440 has 32 divisors (see below), whose sum is σ = 516093480. Its totient is φ = 78642432.

The previous prime is 212990383. The next prime is 212990441. The reversal of 212990440 is 44099212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 55086084 + 157904356 = 7422^2 + 12566^2 .

It is not an unprimeable number, because it can be changed into a prime (212990441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204279 + ... + 205318.

Almost surely, 2^212990440 is an apocalyptic number.

212990440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212990440 is an abundant number, since it is smaller than the sum of its proper divisors (303103040).

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

212990440 is a wasteful number, since it uses less digits than its factorization.

212990440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409621 (or 409617 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 212990440 is about 14594.1919954481. The cubic root of 212990440 is about 597.2003270750.

The spelling of 212990440 in words is "two hundred twelve million, nine hundred ninety thousand, four hundred forty".