431401421 has 12 divisors (see below), whose sum is σ = 476286300. Its totient is φ = 390445440.

The previous prime is 431401417. The next prime is 431401427. The reversal of 431401421 is 124104134.

It can be written as a sum of positive squares in 2 ways, for example, as 298252900 + 133148521 = 17270^2 + 11539^2 .

It is not a de Polignac number, because 431401421 - 2² = 431401417 is a prime.

It is a super-2 number, since 2×431401421² = 372214372081638482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431401393 and 431401402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431401427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19925 + ... + 35493.

It is an arithmetic number, because the mean of its divisors is an integer number (39690525).

Almost surely, 2^431401421 is an apocalyptic number.

It is an amenable number.

431401421 is a deficient number, since it is larger than the sum of its proper divisors (44884879).

431401421 is a wasteful number, since it uses less digits than its factorization.

431401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15820 (or 15809 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 431401421 is about 20770.2051265749. The cubic root of 431401421 is about 755.6033193477.

Adding to 431401421 its reverse (124104134), we get a palindrome (555505555).

The spelling of 431401421 in words is "four hundred thirty-one million, four hundred one thousand, four hundred twenty-one".