55397947 has 8 divisors (see below), whose sum is σ = 60687792. Its totient is φ = 50150400.

The previous prime is 55397933. The next prime is 55397957. The reversal of 55397947 is 74979355.

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

It is a cyclic number.

It is not a de Polignac number, because 55397947 - 2¹⁵ = 55365179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55397947.

It is not an unprimeable number, because it can be changed into a prime (55397957) 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, 7798 + ... + 13099.

It is an arithmetic number, because the mean of its divisors is an integer number (7585974).

Almost surely, 2^55397947 is an apocalyptic number.

55397947 is a deficient number, since it is larger than the sum of its proper divisors (5289845).

55397947 is a wasteful number, since it uses less digits than its factorization.

55397947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21149.

The product of its digits is 1190700, while the sum is 49.

The square root of 55397947 is about 7442.9797124539. The cubic root of 55397947 is about 381.2102389063.

The spelling of 55397947 in words is "fifty-five million, three hundred ninety-seven thousand, nine hundred forty-seven".