97920186 has 64 divisors (see below), whose sum is σ = 253747200. Its totient is φ = 24463296.

The previous prime is 97920181. The next prime is 97920209. The reversal of 97920186 is 68102979.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97920181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5655 + ... + 15093.

It is an arithmetic number, because the mean of its divisors is an integer number (3964800).

Almost surely, 2^97920186 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97920186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126873600).

97920186 is an abundant number, since it is smaller than the sum of its proper divisors (155827014).

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

97920186 is a wasteful number, since it uses less digits than its factorization.

97920186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9483.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 97920186 is about 9895.4628997334. The cubic root of 97920186 is about 460.9184328438.

The spelling of 97920186 in words is "ninety-seven million, nine hundred twenty thousand, one hundred eighty-six".