55438493 has 4 divisors (see below), whose sum is σ = 60478368. Its totient is φ = 50398620.

The previous prime is 55438483. The next prime is 55438499. The reversal of 55438493 is 39483455.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55438493 - 2⁶ = 55438429 is a prime.

It is a super-2 number, since 2×55438493² = 6146853012222098, 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 55438493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55438499) 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, 2519921 + ... + 2519942.

It is an arithmetic number, because the mean of its divisors is an integer number (15119592).

Almost surely, 2^55438493 is an apocalyptic number.

It is an amenable number.

55438493 is a deficient number, since it is larger than the sum of its proper divisors (5039875).

55438493 is a wasteful number, since it uses less digits than its factorization.

55438493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5039874.

The product of its digits is 259200, while the sum is 41.

The square root of 55438493 is about 7445.7029889729. The cubic root of 55438493 is about 381.3032193735.

The spelling of 55438493 in words is "fifty-five million, four hundred thirty-eight thousand, four hundred ninety-three".