215264399 has 8 divisors (see below), whose sum is σ = 251037600. Its totient is φ = 184512048.

The previous prime is 215264393. The next prime is 215264443. The reversal of 215264399 is 993462512.

It is a de Polignac number, because none of the positive numbers 2^k-215264399 is a prime.

It is a super-2 number, since 2×215264399² = 92677522953662402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215264393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313454 + ... + 314139.

It is an arithmetic number, because the mean of its divisors is an integer number (31379700).

Almost surely, 2^215264399 is an apocalyptic number.

215264399 is a deficient number, since it is larger than the sum of its proper divisors (35773201).

215264399 is an frugal number, since it uses more digits than its factorization.

215264399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627614 (or 627600 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 215264399 is about 14671.8914595222. The cubic root of 215264399 is about 599.3181133074.

The spelling of 215264399 in words is "two hundred fifteen million, two hundred sixty-four thousand, three hundred ninety-nine".