55420007 has 4 divisors (see below), whose sum is σ = 55664376. Its totient is φ = 55175640.

The previous prime is 55419929. The next prime is 55420039. The reversal of 55420007 is 70002455.

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 55420007 - 2¹² = 55415911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55422007) 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, 121844 + ... + 122297.

It is an arithmetic number, because the mean of its divisors is an integer number (13916094).

Almost surely, 2^55420007 is an apocalyptic number.

55420007 is a deficient number, since it is larger than the sum of its proper divisors (244369).

55420007 is a wasteful number, since it uses less digits than its factorization.

55420007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244368.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 55420007 is about 7444.4614983221. The cubic root of 55420007 is about 381.2608327299.

The spelling of 55420007 in words is "fifty-five million, four hundred twenty thousand, seven".