213166840 has 16 divisors (see below), whose sum is σ = 479625480. Its totient is φ = 85266720.

The previous prime is 213166817. The next prime is 213166841. The reversal of 213166840 is 48661312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213166841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2664546 + ... + 2664625.

Almost surely, 2^213166840 is an apocalyptic number.

213166840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213166840 is an abundant number, since it is smaller than the sum of its proper divisors (266458640).

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

213166840 is a wasteful number, since it uses less digits than its factorization.

213166840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5329182 (or 5329178 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 213166840 is about 14600.2342446962. The cubic root of 213166840 is about 597.3651499161.

The spelling of 213166840 in words is "two hundred thirteen million, one hundred sixty-six thousand, eight hundred forty".