56409399 has 16 divisors (see below), whose sum is σ = 85609440. Its totient is φ = 36688320.

The previous prime is 56409391. The next prime is 56409401. The reversal of 56409399 is 99390465.

It is a happy number.

It is not a de Polignac number, because 56409399 - 2³ = 56409391 is a prime.

It is a super-4 number, since 4×56409399⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56409391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24372 + ... + 26585.

It is an arithmetic number, because the mean of its divisors is an integer number (5350590).

Almost surely, 2^56409399 is an apocalyptic number.

56409399 is a deficient number, since it is larger than the sum of its proper divisors (29200041).

56409399 is a wasteful number, since it uses less digits than its factorization.

56409399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51007 (or 51001 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 56409399 is about 7510.6190823394. The cubic root of 56409399 is about 383.5162977027.

The spelling of 56409399 in words is "fifty-six million, four hundred nine thousand, three hundred ninety-nine".