357928421 has 4 divisors (see below), whose sum is σ = 378983052. Its totient is φ = 336873792.

The previous prime is 357928409. The next prime is 357928429. The reversal of 357928421 is 124829753.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124829753 = 19 ⋅6569987.

It can be written as a sum of positive squares in 2 ways, for example, as 287133025 + 70795396 = 16945^2 + 8414^2 .

It is a cyclic number.

It is not a de Polignac number, because 357928421 - 2⁶ = 357928357 is a prime.

It is a super-2 number, since 2×357928421² = 256225509119106482, 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 (357928429) 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, 10527290 + ... + 10527323.

It is an arithmetic number, because the mean of its divisors is an integer number (94745763).

Almost surely, 2^357928421 is an apocalyptic number.

It is an amenable number.

357928421 is a deficient number, since it is larger than the sum of its proper divisors (21054631).

357928421 is a wasteful number, since it uses less digits than its factorization.

357928421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21054630.

The product of its digits is 120960, while the sum is 41.

The square root of 357928421 is about 18918.9963000155. The cubic root of 357928421 is about 710.0115193529.

The spelling of 357928421 in words is "three hundred fifty-seven million, nine hundred twenty-eight thousand, four hundred twenty-one".