469976821 has 4 divisors (see below), whose sum is σ = 470034700. Its totient is φ = 469918944.

The previous prime is 469976807. The next prime is 469976839. The reversal of 469976821 is 128679964.

It is a happy number.

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 211120900 + 258855921 = 14530^2 + 16089^2 .

It is a cyclic number.

It is not a de Polignac number, because 469976821 - 2⁵ = 469976789 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 (469976861) 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, 14286 + ... + 33823.

It is an arithmetic number, because the mean of its divisors is an integer number (117508675).

Almost surely, 2^469976821 is an apocalyptic number.

It is an amenable number.

469976821 is a deficient number, since it is larger than the sum of its proper divisors (57879).

469976821 is an equidigital number, since it uses as much as digits as its factorization.

469976821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57878.

The product of its digits is 1306368, while the sum is 52.

The square root of 469976821 is about 21678.9487983158. The cubic root of 469976821 is about 777.4852282288.

The spelling of 469976821 in words is "four hundred sixty-nine million, nine hundred seventy-six thousand, eight hundred twenty-one".