55247439 has 8 divisors (see below), whose sum is σ = 79329712. Its totient is φ = 33998400.

The previous prime is 55247431. The next prime is 55247447. The reversal of 55247439 is 93474255.

It is an interprime number because it is at equal distance from previous prime (55247431) and next prime (55247447).

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

It is not a de Polignac number, because 55247439 - 2³ = 55247431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1416601 = 55247439 / (5 + 5 + 2 + 4 + 7 + 4 + 3 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55247397 and 55247406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55247431) 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, 708262 + ... + 708339.

It is an arithmetic number, because the mean of its divisors is an integer number (9916214).

Almost surely, 2^55247439 is an apocalyptic number.

55247439 is a deficient number, since it is larger than the sum of its proper divisors (24082273).

55247439 is a wasteful number, since it uses less digits than its factorization.

55247439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416617.

The product of its digits is 151200, while the sum is 39.

The square root of 55247439 is about 7432.8621001603. The cubic root of 55247439 is about 380.8646952399.

The spelling of 55247439 in words is "fifty-five million, two hundred forty-seven thousand, four hundred thirty-nine".