213437730 has 32 divisors (see below), whose sum is σ = 558819648. Its totient is φ = 51742400.

The previous prime is 213437713. The next prime is 213437743. The reversal of 213437730 is 37734312.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323061 + ... + 323720.

It is an arithmetic number, because the mean of its divisors is an integer number (17463114).

Almost surely, 2^213437730 is an apocalyptic number.

213437730 is an abundant number, since it is smaller than the sum of its proper divisors (345381918).

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

213437730 is a wasteful number, since it uses less digits than its factorization.

213437730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646802.

The product of its (nonzero) digits is 10584, while the sum is 30.

The square root of 213437730 is about 14609.5082052751. The cubic root of 213437730 is about 597.6180844209.

The spelling of 213437730 in words is "two hundred thirteen million, four hundred thirty-seven thousand, seven hundred thirty".