55397939 has 4 divisors (see below), whose sum is σ = 58313640. Its totient is φ = 52482240.

The previous prime is 55397933. The next prime is 55397957. The reversal of 55397939 is 93979355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93979355 = 5 ⋅18795871.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55397939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55397933) 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, 1457822 + ... + 1457859.

It is an arithmetic number, because the mean of its divisors is an integer number (14578410).

Almost surely, 2^55397939 is an apocalyptic number.

55397939 is a deficient number, since it is larger than the sum of its proper divisors (2915701).

55397939 is a wasteful number, since it uses less digits than its factorization.

55397939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915700.

The product of its digits is 1148175, while the sum is 50.

The square root of 55397939 is about 7442.9791750347. The cubic root of 55397939 is about 381.2102205562.

The spelling of 55397939 in words is "fifty-five million, three hundred ninety-seven thousand, nine hundred thirty-nine".