40197618 has 12 divisors (see below), whose sum is σ = 87094878. Its totient is φ = 13399200.

The previous prime is 40197601. The next prime is 40197713. The reversal of 40197618 is 81679104.

It can be written as a sum of positive squares in only one way, i.e., 33212169 + 6985449 = 5763^2 + 2643^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1116583 + ... + 1116618.

Almost surely, 2^40197618 is an apocalyptic number.

40197618 is an abundant number, since it is smaller than the sum of its proper divisors (46897260).

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

40197618 is a wasteful number, since it uses less digits than its factorization.

40197618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233209 (or 2233206 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 40197618 is about 6340.1591462675. The cubic root of 40197618 is about 342.5574677577.

The spelling of 40197618 in words is "forty million, one hundred ninety-seven thousand, six hundred eighteen".