54239821 has 4 divisors (see below), whose sum is σ = 55159200. Its totient is φ = 53320444.

The previous prime is 54239789. The next prime is 54239849. The reversal of 54239821 is 12893245.

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 54239821 - 2⁵ = 54239789 is a prime.

It is a super-2 number, since 2×54239821² = 5883916364224082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54239881) 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, 459601 + ... + 459718.

It is an arithmetic number, because the mean of its divisors is an integer number (13789800).

Almost surely, 2^54239821 is an apocalyptic number.

It is an amenable number.

54239821 is a deficient number, since it is larger than the sum of its proper divisors (919379).

54239821 is an equidigital number, since it uses as much as digits as its factorization.

54239821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919378.

The product of its digits is 17280, while the sum is 34.

The square root of 54239821 is about 7364.7689033669. The cubic root of 54239821 is about 378.5350359361.

The spelling of 54239821 in words is "fifty-four million, two hundred thirty-nine thousand, eight hundred twenty-one".