55407243 has 4 divisors (see below), whose sum is σ = 73876328. Its totient is φ = 36938160.

The previous prime is 55407239. The next prime is 55407251. The reversal of 55407243 is 34270455.

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

It is not a de Polignac number, because 55407243 - 2² = 55407239 is a prime.

It is a super-2 number, since 2×55407243² = 6139925153722098, which contains 22 as substring.

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 55407243.

It is not an unprimeable number, because it can be changed into a prime (55407223) 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, 9234538 + ... + 9234543.

It is an arithmetic number, because the mean of its divisors is an integer number (18469082).

Almost surely, 2^55407243 is an apocalyptic number.

55407243 is a deficient number, since it is larger than the sum of its proper divisors (18469085).

55407243 is a wasteful number, since it uses less digits than its factorization.

55407243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18469084.

The product of its (nonzero) digits is 16800, while the sum is 30.

The square root of 55407243 is about 7443.6041673372. The cubic root of 55407243 is about 381.2315605881.

Adding to 55407243 its reverse (34270455), we get a palindrome (89677698).

The spelling of 55407243 in words is "fifty-five million, four hundred seven thousand, two hundred forty-three".