97218140 has 24 divisors (see below), whose sum is σ = 207507552. Its totient is φ = 38249280.

The previous prime is 97218127. The next prime is 97218157. The reversal of 97218140 is 4181279.

It is a junction number, because it is equal to n+sod(n) for n = 97218097 and 97218106.

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, 38624 + ... + 41063.

It is an arithmetic number, because the mean of its divisors is an integer number (8646148).

Almost surely, 2^97218140 is an apocalyptic number.

It is an amenable number.

97218140 is an abundant number, since it is smaller than the sum of its proper divisors (110289412).

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

97218140 is a wasteful number, since it uses less digits than its factorization.

97218140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79757 (or 79755 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 97218140 is about 9859.9259632109. The cubic root of 97218140 is about 459.8142602354.

The spelling of 97218140 in words is "ninety-seven million, two hundred eighteen thousand, one hundred forty".