55420405 has 8 divisors (see below), whose sum is σ = 68649984. Its totient is φ = 42906000.

The previous prime is 55420381. The next prime is 55420427. The reversal of 55420405 is 50402455.

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

It is not a de Polignac number, because 55420405 - 2⁹ = 55419893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55420405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178621 + ... + 178930.

It is an arithmetic number, because the mean of its divisors is an integer number (8581248).

Almost surely, 2^55420405 is an apocalyptic number.

It is an amenable number.

55420405 is a deficient number, since it is larger than the sum of its proper divisors (13229579).

55420405 is a wasteful number, since it uses less digits than its factorization.

55420405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357587.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 55420405 is about 7444.4882295561. The cubic root of 55420405 is about 381.2617454054.

The spelling of 55420405 in words is "fifty-five million, four hundred twenty thousand, four hundred five".