55396404 has 144 divisors (see below), whose sum is σ = 172867968. Its totient is φ = 14598144.

The previous prime is 55396391. The next prime is 55396417. The reversal of 55396404 is 40469355.

It is a happy number.

55396404 is a `hidden beast` number, since 5 + 5 + 3 + 9 + 640 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (55396391) and next prime (55396417).

It is a super-2 number, since 2×55396404² = 6137523152262432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 286932 + ... + 287124.

It is an arithmetic number, because the mean of its divisors is an integer number (1200472).

Almost surely, 2^55396404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55396404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86433984).

55396404 is an abundant number, since it is smaller than the sum of its proper divisors (117471564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55396404 is a wasteful number, since it uses less digits than its factorization.

55396404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 55396404 is about 7442.8760570091. The cubic root of 55396404 is about 381.2066995883.

The spelling of 55396404 in words is "fifty-five million, three hundred ninety-six thousand, four hundred four".