215394164 has 6 divisors (see below), whose sum is σ = 376939794. Its totient is φ = 107697080.

The previous prime is 215394143. The next prime is 215394187. The reversal of 215394164 is 461493512.

It can be written as a sum of positive squares in only one way, i.e., 185232100 + 30162064 = 13610^2 + 5492^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26924267 + ... + 26924274.

It is an arithmetic number, because the mean of its divisors is an integer number (62823299).

Almost surely, 2^215394164 is an apocalyptic number.

It is an amenable number.

215394164 is a deficient number, since it is larger than the sum of its proper divisors (161545630).

215394164 is a wasteful number, since it uses less digits than its factorization.

215394164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53848545 (or 53848543 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 215394164 is about 14676.3130247348. The cubic root of 215394164 is about 599.4385154632.

The spelling of 215394164 in words is "two hundred fifteen million, three hundred ninety-four thousand, one hundred sixty-four".