421942731 has 16 divisors (see below), whose sum is σ = 643494144. Its totient is φ = 240909984.

The previous prime is 421942711. The next prime is 421942757. The reversal of 421942731 is 137249124.

It is not a de Polignac number, because 421942731 - 2⁶ = 421942667 is a prime.

It is a super-2 number, since 2×421942731² = 356071336487476722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421942692 and 421942701.

It is not an unprimeable number, because it can be changed into a prime (421942711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19761 + ... + 35133.

It is an arithmetic number, because the mean of its divisors is an integer number (40218384).

Almost surely, 2^421942731 is an apocalyptic number.

421942731 is a deficient number, since it is larger than the sum of its proper divisors (221551413).

421942731 is a wasteful number, since it uses less digits than its factorization.

421942731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16690.

The product of its digits is 12096, while the sum is 33.

The square root of 421942731 is about 20541.2446312291. The cubic root of 421942731 is about 750.0401347411.

The spelling of 421942731 in words is "four hundred twenty-one million, nine hundred forty-two thousand, seven hundred thirty-one".