97831240 has 32 divisors (see below), whose sum is σ = 237053880. Its totient is φ = 36122112.

The previous prime is 97831231. The next prime is 97831241. The reversal of 97831240 is 4213879.

It can be written as a sum of positive squares in 4 ways, for example, as 81974916 + 15856324 = 9054^2 + 3982^2 .

It is a junction number, because it is equal to n+sod(n) for n = 97831196 and 97831205.

It is not an unprimeable number, because it can be changed into a prime (97831241) 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, 93549 + ... + 94588.

Almost surely, 2^97831240 is an apocalyptic number.

It is an amenable number.

97831240 is an abundant number, since it is smaller than the sum of its proper divisors (139222640).

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

97831240 is a wasteful number, since it uses less digits than its factorization.

97831240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188161 (or 188157 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 97831240 is about 9890.9675967521. The cubic root of 97831240 is about 460.7788318345.

The spelling of 97831240 in words is "ninety-seven million, eight hundred thirty-one thousand, two hundred forty".