3557421 has 12 divisors (see below), whose sum is σ = 5872672. Its totient is φ = 2032776.

The previous prime is 3557381. The next prime is 3557431. The reversal of 3557421 is 1247553.

It is a happy number.

It is not a de Polignac number, because 3557421 - 2⁷ = 3557293 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 (3557431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28171 + ... + 28296.

Almost surely, 2^3557421 is an apocalyptic number.

It is an amenable number.

3557421 is a deficient number, since it is larger than the sum of its proper divisors (2315251).

3557421 is a wasteful number, since it uses less digits than its factorization.

3557421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56480 (or 56477 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 3557421 is about 1886.1126689570. The cubic root of 3557421 is about 152.6552535173.

It can be divided in two parts, 355 and 7421, that added together give a 5-th power (7776 = 6⁵).

The spelling of 3557421 in words is "three million, five hundred fifty-seven thousand, four hundred twenty-one".