212745540 has 48 divisors (see below), whose sum is σ = 680787072. Its totient is φ = 48627456.

The previous prime is 212745503. The next prime is 212745557. The reversal of 212745540 is 45547212.

212745540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 212745498 and 212745507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252849 + ... + 253688.

It is an arithmetic number, because the mean of its divisors is an integer number (14183064).

Almost surely, 2^212745540 is an apocalyptic number.

212745540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212745540 is an abundant number, since it is smaller than the sum of its proper divisors (468041532).

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

212745540 is a wasteful number, since it uses less digits than its factorization.

212745540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506556 (or 506554 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 212745540 is about 14585.7992581826. The cubic root of 212745540 is about 596.9713489557.

The spelling of 212745540 in words is "two hundred twelve million, seven hundred forty-five thousand, five hundred forty".