56440387 has 2 divisors, whose sum is σ = 56440388. Its totient is φ = 56440386.

The previous prime is 56440379. The next prime is 56440411. The reversal of 56440387 is 78304465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56440387 - 2³ = 56440379 is a prime.

It is not a weakly prime, because it can be changed into another prime (56440487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28220193 + 28220194.

It is an arithmetic number, because the mean of its divisors is an integer number (28220194).

Almost surely, 2^56440387 is an apocalyptic number.

56440387 is a deficient number, since it is larger than the sum of its proper divisors (1).

56440387 is an equidigital number, since it uses as much as digits as its factorization.

56440387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 56440387 is about 7512.6817448898. The cubic root of 56440387 is about 383.5865119324.

The spelling of 56440387 in words is "fifty-six million, four hundred forty thousand, three hundred eighty-seven".