356421809 has 4 divisors (see below), whose sum is σ = 356471616. Its totient is φ = 356372004.

The previous prime is 356421763. The next prime is 356421811. The reversal of 356421809 is 908124653.

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.

It is a cyclic number.

It is not a de Polignac number, because 356421809 - 2²⁴ = 339644593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (356421839) 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, 11909 + ... + 29234.

It is an arithmetic number, because the mean of its divisors is an integer number (89117904).

Almost surely, 2^356421809 is an apocalyptic number.

It is an amenable number.

356421809 is a deficient number, since it is larger than the sum of its proper divisors (49807).

356421809 is an equidigital number, since it uses as much as digits as its factorization.

356421809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49806.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 356421809 is about 18879.1368711602. The cubic root of 356421809 is about 709.0139117972.

The spelling of 356421809 in words is "three hundred fifty-six million, four hundred twenty-one thousand, eight hundred nine".