212989720 has 16 divisors (see below), whose sum is σ = 479226960. Its totient is φ = 85195872.

The previous prime is 212989697. The next prime is 212989757. The reversal of 212989720 is 27989212.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 5324743 = 212989720 / (2 + 1 + 2 + 9 + 8 + 9 + 7 + 2 + 0).

It is a congruent number.

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, 2662332 + ... + 2662411.

It is an arithmetic number, because the mean of its divisors is an integer number (29951685).

Almost surely, 2^212989720 is an apocalyptic number.

212989720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212989720 is an abundant number, since it is smaller than the sum of its proper divisors (266237240).

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

212989720 is a wasteful number, since it uses less digits than its factorization.

212989720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324754 (or 5324750 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 212989720 is about 14594.1673280801. The cubic root of 212989720 is about 597.1996541423.

The spelling of 212989720 in words is "two hundred twelve million, nine hundred eighty-nine thousand, seven hundred twenty".