40431320 has 16 divisors (see below), whose sum is σ = 90970560. Its totient is φ = 16172512.

The previous prime is 40431317. The next prime is 40431323. The reversal of 40431320 is 2313404.

It is an interprime number because it is at equal distance from previous prime (40431317) and next prime (40431323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40431323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505352 + ... + 505431.

It is an arithmetic number, because the mean of its divisors is an integer number (5685660).

Almost surely, 2^40431320 is an apocalyptic number.

40431320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40431320 is an abundant number, since it is smaller than the sum of its proper divisors (50539240).

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

40431320 is a wasteful number, since it uses less digits than its factorization.

40431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010794 (or 1010790 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 40431320 is about 6358.5627306806. The cubic root of 40431320 is about 343.2200420084.

Adding to 40431320 its reverse (2313404), we get a palindrome (42744724).

The spelling of 40431320 in words is "forty million, four hundred thirty-one thousand, three hundred twenty".