421972669 has 4 divisors (see below), whose sum is σ = 423614844. Its totient is φ = 420330496.

The previous prime is 421972643. The next prime is 421972673. The reversal of 421972669 is 966279124.

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 385611769 + 36360900 = 19637^2 + 6030^2 .

It is a cyclic number.

It is not a de Polignac number, because 421972669 - 2⁵ = 421972637 is a prime.

It is a super-2 number, since 2×421972669² = 356121866765967122, 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 (421972609) 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, 820702 + ... + 821215.

It is an arithmetic number, because the mean of its divisors is an integer number (105903711).

Almost surely, 2^421972669 is an apocalyptic number.

It is an amenable number.

421972669 is a deficient number, since it is larger than the sum of its proper divisors (1642175).

421972669 is a wasteful number, since it uses less digits than its factorization.

421972669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642174.

The product of its digits is 326592, while the sum is 46.

The square root of 421972669 is about 20541.9733472712. The cubic root of 421972669 is about 750.0578734600.

The spelling of 421972669 in words is "four hundred twenty-one million, nine hundred seventy-two thousand, six hundred sixty-nine".