55404421 has 8 divisors (see below), whose sum is σ = 56294784. Its totient is φ = 54521040.

The previous prime is 55404403. The next prime is 55404431. The reversal of 55404421 is 12440455.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55404421 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 (55404431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15591 + ... + 18811.

It is an arithmetic number, because the mean of its divisors is an integer number (7036848).

Almost surely, 2^55404421 is an apocalyptic number.

It is an amenable number.

55404421 is a deficient number, since it is larger than the sum of its proper divisors (890363).

55404421 is a wasteful number, since it uses less digits than its factorization.

55404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 55404421 is about 7443.4146062140. The cubic root of 55404421 is about 381.2250881868.

Adding to 55404421 its reverse (12440455), we get a palindrome (67844876).

The spelling of 55404421 in words is "fifty-five million, four hundred four thousand, four hundred twenty-one".