421696731 has 4 divisors (see below), whose sum is σ = 562262312. Its totient is φ = 281131152.

The previous prime is 421696699. The next prime is 421696741. The reversal of 421696731 is 137696124.

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

It is not a de Polignac number, because 421696731 - 2⁵ = 421696699 is a prime.

It is a super-2 number, since 2×421696731² = 355656265872172722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421696731.

It is not an unprimeable number, because it can be changed into a prime (421696741) 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, 70282786 + ... + 70282791.

It is an arithmetic number, because the mean of its divisors is an integer number (140565578).

Almost surely, 2^421696731 is an apocalyptic number.

421696731 is a deficient number, since it is larger than the sum of its proper divisors (140565581).

421696731 is a wasteful number, since it uses less digits than its factorization.

421696731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140565580.

The product of its digits is 54432, while the sum is 39.

The square root of 421696731 is about 20535.2558055652. The cubic root of 421696731 is about 749.8943442276.

The spelling of 421696731 in words is "four hundred twenty-one million, six hundred ninety-six thousand, seven hundred thirty-one".