420642431 has 8 divisors (see below), whose sum is σ = 459043200. Its totient is φ = 382268440.

The previous prime is 420642403. The next prime is 420642457. The reversal of 420642431 is 134246024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420642431 - 2⁶ = 420642367 is a prime.

It is a super-2 number, since 2×420642431² = 353880109515179522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 420642431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420642401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40910 + ... + 50148.

It is an arithmetic number, because the mean of its divisors is an integer number (57380400).

Almost surely, 2^420642431 is an apocalyptic number.

420642431 is a deficient number, since it is larger than the sum of its proper divisors (38400769).

420642431 is a wasteful number, since it uses less digits than its factorization.

420642431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13389.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 420642431 is about 20509.5692543749. The cubic root of 420642431 is about 749.2688762498.

Adding to 420642431 its reverse (134246024), we get a palindrome (554888455).

The spelling of 420642431 in words is "four hundred twenty million, six hundred forty-two thousand, four hundred thirty-one".