97212540 has 24 divisors (see below), whose sum is σ = 272195280. Its totient is φ = 25923328.

The previous prime is 97212529. The next prime is 97212587. The reversal of 97212540 is 4521279.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 97212498 and 97212507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 810045 + ... + 810164.

It is an arithmetic number, because the mean of its divisors is an integer number (11341470).

Almost surely, 2^97212540 is an apocalyptic number.

It is an amenable number.

97212540 is an abundant number, since it is smaller than the sum of its proper divisors (174982740).

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

97212540 is a wasteful number, since it uses less digits than its factorization.

97212540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620221 (or 1620219 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 97212540 is about 9859.6419813297. The cubic root of 97212540 is about 459.8054312614.

The spelling of 97212540 in words is "ninety-seven million, two hundred twelve thousand, five hundred forty".