55400401 has 4 divisors (see below), whose sum is σ = 63314752. Its totient is φ = 47486052.

The previous prime is 55400369. The next prime is 55400407. The reversal of 55400401 is 10400455.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55400401 - 2⁵ = 55400369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55400407) 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, 3957165 + ... + 3957178.

It is an arithmetic number, because the mean of its divisors is an integer number (15828688).

Almost surely, 2^55400401 is an apocalyptic number.

It is an amenable number.

55400401 is a deficient number, since it is larger than the sum of its proper divisors (7914351).

55400401 is an equidigital number, since it uses as much as digits as its factorization.

55400401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7914350.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 55400401 is about 7443.1445639595. The cubic root of 55400401 is about 381.2158677317.

Adding to 55400401 its reverse (10400455), we get a palindrome (65800856).

The spelling of 55400401 in words is "fifty-five million, four hundred thousand, four hundred one".