420440031 has 24 divisors (see below), whose sum is σ = 684652080. Its totient is φ = 254810160.

The previous prime is 420440003. The next prime is 420440047. The reversal of 420440031 is 130044024.

It is not a de Polignac number, because 420440031 - 2¹⁰ = 420439007 is a prime.

It is a super-2 number, since 2×420440031² = 353539639334561922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 420439986 and 420440013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420440131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61080 + ... + 67613.

It is an arithmetic number, because the mean of its divisors is an integer number (28527170).

Almost surely, 2^420440031 is an apocalyptic number.

420440031 is a deficient number, since it is larger than the sum of its proper divisors (264212049).

420440031 is a wasteful number, since it uses less digits than its factorization.

420440031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128724 (or 128707 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 420440031 is about 20504.6343785984. The cubic root of 420440031 is about 749.1486820426.

Adding to 420440031 its reverse (130044024), we get a palindrome (550484055).

The spelling of 420440031 in words is "four hundred twenty million, four hundred forty thousand, thirty-one".