40390398 has 12 divisors (see below), whose sum is σ = 87512568. Its totient is φ = 13463460.

The previous prime is 40390393. The next prime is 40390411. The reversal of 40390398 is 89309304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40390391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1121938 + ... + 1121973.

It is an arithmetic number, because the mean of its divisors is an integer number (7292714).

Almost surely, 2^40390398 is an apocalyptic number.

40390398 is an abundant number, since it is smaller than the sum of its proper divisors (47122170).

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

40390398 is a wasteful number, since it uses less digits than its factorization.

40390398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243919 (or 2243916 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 40390398 is about 6355.3440504822. The cubic root of 40390398 is about 343.1042077839.

The spelling of 40390398 in words is "forty million, three hundred ninety thousand, three hundred ninety-eight".