213451730 has 16 divisors (see below), whose sum is σ = 400918464. Its totient is φ = 81668400.

The previous prime is 213451727. The next prime is 213451751. The reversal of 213451730 is 37154312.

It is a super-3 number, since 3×213451730³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213451730.

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 7 ways as a sum of consecutive naturals, for example, 463796 + ... + 464255.

It is an arithmetic number, because the mean of its divisors is an integer number (25057404).

Almost surely, 2^213451730 is an apocalyptic number.

213451730 is a deficient number, since it is larger than the sum of its proper divisors (187466734).

213451730 is a wasteful number, since it uses less digits than its factorization.

213451730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928081.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 213451730 is about 14609.9873374346. The cubic root of 213451730 is about 597.6311506366.

The spelling of 213451730 in words is "two hundred thirteen million, four hundred fifty-one thousand, seven hundred thirty".