38557421 has 4 divisors (see below), whose sum is σ = 44065632. Its totient is φ = 33049212.

The previous prime is 38557357. The next prime is 38557433. The reversal of 38557421 is 12475583.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12475583 = 2957 ⋅4219.

It is not a de Polignac number, because 38557421 - 2⁶ = 38557357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38557471) 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, 2754095 + ... + 2754108.

It is an arithmetic number, because the mean of its divisors is an integer number (11016408).

Almost surely, 2^38557421 is an apocalyptic number.

It is an amenable number.

38557421 is a deficient number, since it is larger than the sum of its proper divisors (5508211).

38557421 is an equidigital number, since it uses as much as digits as its factorization.

38557421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5508210.

The product of its digits is 33600, while the sum is 35.

The square root of 38557421 is about 6209.4622150392. The cubic root of 38557421 is about 337.8334584463.

The spelling of 38557421 in words is "thirty-eight million, five hundred fifty-seven thousand, four hundred twenty-one".