56405289 has 8 divisors (see below), whose sum is σ = 76159360. Its totient is φ = 37127376.

The previous prime is 56405287. The next prime is 56405317. The reversal of 56405289 is 98250465.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56405289 - 2¹ = 56405287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56405287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118762 + ... + 119235.

It is an arithmetic number, because the mean of its divisors is an integer number (9519920).

Almost surely, 2^56405289 is an apocalyptic number.

It is an amenable number.

56405289 is a deficient number, since it is larger than the sum of its proper divisors (19754071).

56405289 is a wasteful number, since it uses less digits than its factorization.

56405289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238079.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 56405289 is about 7510.3454647573. The cubic root of 56405289 is about 383.5069831186.

The spelling of 56405289 in words is "fifty-six million, four hundred five thousand, two hundred eighty-nine".