55398590 has 32 divisors (see below), whose sum is σ = 108241056. Its totient is φ = 20292480.

The previous prime is 55398569. The next prime is 55398593. The reversal of 55398590 is 9589355.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55398593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15404 + ... + 18656.

It is an arithmetic number, because the mean of its divisors is an integer number (3382533).

Almost surely, 2^55398590 is an apocalyptic number.

55398590 is a deficient number, since it is larger than the sum of its proper divisors (52842466).

55398590 is a wasteful number, since it uses less digits than its factorization.

55398590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 55398590 is about 7443.0229073945. The cubic root of 55398590 is about 381.2117137939.

The spelling of 55398590 in words is "fifty-five million, three hundred ninety-eight thousand, five hundred ninety".