40131390 has 64 divisors (see below), whose sum is σ = 109843776. Its totient is φ = 9295872.

The previous prime is 40131379. The next prime is 40131397. The reversal of 40131390 is 9313104.

It is a super-2 number, since 2×40131390² = 3221056926664200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40131397) 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, 3604 + ... + 9656.

It is an arithmetic number, because the mean of its divisors is an integer number (1716309).

Almost surely, 2^40131390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40131390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54921888).

40131390 is an abundant number, since it is smaller than the sum of its proper divisors (69712386).

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

40131390 is a wasteful number, since it uses less digits than its factorization.

40131390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6093.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 40131390 is about 6334.9340959476. The cubic root of 40131390 is about 342.3692363162.

Adding to 40131390 its reverse (9313104), we get a palindrome (49444494).

The spelling of 40131390 in words is "forty million, one hundred thirty-one thousand, three hundred ninety".