55390418 has 4 divisors (see below), whose sum is σ = 83085630. Its totient is φ = 27695208.

The previous prime is 55390411. The next prime is 55390427. The reversal of 55390418 is 81409355.

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

It can be written as a sum of positive squares in only one way, i.e., 54567769 + 822649 = 7387^2 + 907^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55390411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13847603 + ... + 13847606.

Almost surely, 2^55390418 is an apocalyptic number.

55390418 is a deficient number, since it is larger than the sum of its proper divisors (27695212).

55390418 is a wasteful number, since it uses less digits than its factorization.

55390418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27695211.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 55390418 is about 7442.4739166490. The cubic root of 55390418 is about 381.1929683390.

The spelling of 55390418 in words is "fifty-five million, three hundred ninety thousand, four hundred eighteen".