55415387 has 4 divisors (see below), whose sum is σ = 55456896. Its totient is φ = 55373880.

The previous prime is 55415377. The next prime is 55415401. The reversal of 55415387 is 78351455.

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

It is a cyclic number.

It is not a de Polignac number, because 55415387 - 2⁶ = 55415323 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 55415387.

It is not an unprimeable number, because it can be changed into a prime (55415377) 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, 18683 + ... + 21444.

It is an arithmetic number, because the mean of its divisors is an integer number (13864224).

Almost surely, 2^55415387 is an apocalyptic number.

55415387 is a deficient number, since it is larger than the sum of its proper divisors (41509).

55415387 is a wasteful number, since it uses less digits than its factorization.

55415387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41508.

The product of its digits is 84000, while the sum is 38.

The square root of 55415387 is about 7444.1511940583. The cubic root of 55415387 is about 381.2502380362.

The spelling of 55415387 in words is "fifty-five million, four hundred fifteen thousand, three hundred eighty-seven".