55238923 has 4 divisors (see below), whose sum is σ = 56017008. Its totient is φ = 54460840.

The previous prime is 55238917. The next prime is 55238983. The reversal of 55238923 is 32983255.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55238923 - 2²¹ = 53141771 is a prime.

It is a super-2 number, since 2×55238923² = 6102677228399858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55238903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388936 + ... + 389077.

It is an arithmetic number, because the mean of its divisors is an integer number (14004252).

Almost surely, 2^55238923 is an apocalyptic number.

55238923 is a deficient number, since it is larger than the sum of its proper divisors (778085).

55238923 is an equidigital number, since it uses as much as digits as its factorization.

55238923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778084.

The product of its digits is 64800, while the sum is 37.

The square root of 55238923 is about 7432.2892166546. The cubic root of 55238923 is about 380.8451250392.

The spelling of 55238923 in words is "fifty-five million, two hundred thirty-eight thousand, nine hundred twenty-three".