55977389 has 4 divisors (see below), whose sum is σ = 60283356. Its totient is φ = 51671424.

The previous prime is 55977373. The next prime is 55977407. The reversal of 55977389 is 98377955.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35880100 + 20097289 = 5990^2 + 4483^2 .

It is a cyclic number.

It is not a de Polignac number, because 55977389 - 2⁴ = 55977373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55977389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55977359) 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, 2152964 + ... + 2152989.

It is an arithmetic number, because the mean of its divisors is an integer number (15070839).

Almost surely, 2^55977389 is an apocalyptic number.

It is an amenable number.

55977389 is a deficient number, since it is larger than the sum of its proper divisors (4305967).

55977389 is a wasteful number, since it uses less digits than its factorization.

55977389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305966.

The product of its digits is 2381400, while the sum is 53.

The square root of 55977389 is about 7481.8038600327. The cubic root of 55977389 is about 382.5347376143.

The spelling of 55977389 in words is "fifty-five million, nine hundred seventy-seven thousand, three hundred eighty-nine".