1097857215 has 96 divisors (see below), whose sum is σ = 2361655296. Its totient is φ = 459406080.

The previous prime is 1097857213. The next prime is 1097857231. The reversal of 1097857215 is 5127587901.

1097857215 is a `hidden beast` number, since 1 + 0 + 9 + 78 + 572 + 1 + 5 = 666.

It is not a de Polignac number, because 1097857215 - 2¹ = 1097857213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097857213) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 519010 + ... + 521120.

It is an arithmetic number, because the mean of its divisors is an integer number (24600576).

Almost surely, 2^1097857215 is an apocalyptic number.

1097857215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1097857215 is an abundant number, since it is smaller than the sum of its proper divisors (1263798081).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1097857215 is a wasteful number, since it uses less digits than its factorization.

1097857215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2269 (or 2266 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 45.

The square root of 1097857215 is about 33133.9284570967. The cubic root of 1097857215 is about 1031.6093905505.

The spelling of 1097857215 in words is "one billion, ninety-seven million, eight hundred fifty-seven thousand, two hundred fifteen".