40465638 has 24 divisors (see below), whose sum is σ = 88349976. Its totient is φ = 13385580.

The previous prime is 40465613. The next prime is 40465673. The reversal of 40465638 is 83656404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308833 + ... + 308963.

It is an arithmetic number, because the mean of its divisors is an integer number (3681249).

Almost surely, 2^40465638 is an apocalyptic number.

40465638 is an abundant number, since it is smaller than the sum of its proper divisors (47884338).

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

40465638 is an frugal number, since it uses more digits than its factorization.

40465638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 40465638 is about 6361.2607241018. The cubic root of 40465638 is about 343.3171226414.

The spelling of 40465638 in words is "forty million, four hundred sixty-five thousand, six hundred thirty-eight".