212187492 has 48 divisors (see below), whose sum is σ = 600129600. Its totient is φ = 64298880.

The previous prime is 212187491. The next prime is 212187509. The reversal of 212187492 is 294781212.

212187492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212187492² = 90047063522500128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (212187491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88117 + ... + 90492.

It is an arithmetic number, because the mean of its divisors is an integer number (12502700).

Almost surely, 2^212187492 is an apocalyptic number.

212187492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

212187492 is an abundant number, since it is smaller than the sum of its proper divisors (387942108).

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

212187492 is a wasteful number, since it uses less digits than its factorization.

212187492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178633 (or 178625 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 212187492 is about 14566.6568573575. The cubic root of 212187492 is about 596.4489245680.

The spelling of 212187492 in words is "two hundred twelve million, one hundred eighty-seven thousand, four hundred ninety-two".