440131387 has 2 divisors, whose sum is σ = 440131388. Its totient is φ = 440131386.

The previous prime is 440131379. The next prime is 440131457. The reversal of 440131387 is 783131044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 440131387 - 2³ = 440131379 is a prime.

It is not a weakly prime, because it can be changed into another prime (440131337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220065693 + 220065694.

It is an arithmetic number, because the mean of its divisors is an integer number (220065694).

Almost surely, 2^440131387 is an apocalyptic number.

440131387 is a deficient number, since it is larger than the sum of its proper divisors (1).

440131387 is an equidigital number, since it uses as much as digits as its factorization.

440131387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 440131387 is about 20979.3085443730. The cubic root of 440131387 is about 760.6661904537. Note that the first 3 decimals are identical.

The spelling of 440131387 in words is "four hundred forty million, one hundred thirty-one thousand, three hundred eighty-seven".