356428921 has 4 divisors (see below), whose sum is σ = 356648292. Its totient is φ = 356209552.

The previous prime is 356428913. The next prime is 356428939. The reversal of 356428921 is 129824653.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164994025 + 191434896 = 12845^2 + 13836^2 .

It is a cyclic number.

It is not a de Polignac number, because 356428921 - 2³ = 356428913 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (356428951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107230 + ... + 110503.

It is an arithmetic number, because the mean of its divisors is an integer number (89162073).

Almost surely, 2^356428921 is an apocalyptic number.

It is an amenable number.

356428921 is a deficient number, since it is larger than the sum of its proper divisors (219371).

356428921 is a wasteful number, since it uses less digits than its factorization.

356428921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219370.

The product of its digits is 103680, while the sum is 40.

The square root of 356428921 is about 18879.3252262892. The cubic root of 356428921 is about 709.0186276266.

The spelling of 356428921 in words is "three hundred fifty-six million, four hundred twenty-eight thousand, nine hundred twenty-one".