55401839 has 4 divisors (see below), whose sum is σ = 56899224. Its totient is φ = 53904456.

The previous prime is 55401821. The next prime is 55401859. The reversal of 55401839 is 93810455.

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 55401839 - 2⁸ = 55401583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55401799 and 55401808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55401859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748637 + ... + 748710.

It is an arithmetic number, because the mean of its divisors is an integer number (14224806).

Almost surely, 2^55401839 is an apocalyptic number.

55401839 is a deficient number, since it is larger than the sum of its proper divisors (1497385).

55401839 is a wasteful number, since it uses less digits than its factorization.

55401839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497384.

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

The square root of 55401839 is about 7443.2411622894. The cubic root of 55401839 is about 381.2191660453.

The spelling of 55401839 in words is "fifty-five million, four hundred one thousand, eight hundred thirty-nine".