215238397 has 16 divisors (see below), whose sum is σ = 242222400. Its totient is φ = 189558400.

The previous prime is 215238337. The next prime is 215238407. The reversal of 215238397 is 793832512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215238397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215238337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65598 + ... + 68800.

It is an arithmetic number, because the mean of its divisors is an integer number (15138900).

Almost surely, 2^215238397 is an apocalyptic number.

It is an amenable number.

215238397 is a deficient number, since it is larger than the sum of its proper divisors (26984003).

215238397 is a wasteful number, since it uses less digits than its factorization.

215238397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404.

The product of its digits is 90720, while the sum is 40.

The square root of 215238397 is about 14671.0053166100. The cubic root of 215238397 is about 599.2939815929.

The spelling of 215238397 in words is "two hundred fifteen million, two hundred thirty-eight thousand, three hundred ninety-seven".