213915947 has 16 divisors (see below), whose sum is σ = 260029440. Its totient is φ = 171788928.

The previous prime is 213915931. The next prime is 213915953. The reversal of 213915947 is 749519312.

It is a cyclic number.

It is not a de Polignac number, because 213915947 - 2⁴ = 213915931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213915917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23054 + ... + 30972.

It is an arithmetic number, because the mean of its divisors is an integer number (16251840).

Almost surely, 2^213915947 is an apocalyptic number.

213915947 is a deficient number, since it is larger than the sum of its proper divisors (46113493).

213915947 is a wasteful number, since it uses less digits than its factorization.

213915947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8170.

The product of its digits is 68040, while the sum is 41.

The square root of 213915947 is about 14625.8656837809. The cubic root of 213915947 is about 598.0640817149.

The spelling of 213915947 in words is "two hundred thirteen million, nine hundred fifteen thousand, nine hundred forty-seven".