431421240 has 128 divisors (see below), whose sum is σ = 1389648960. Its totient is φ = 106758144.

The previous prime is 431421227. The next prime is 431421259. The reversal of 431421240 is 42124134.

It is a super-2 number, since 2×431421240² = 372248572646275200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147472 + ... + 150368.

Almost surely, 2^431421240 is an apocalyptic number.

431421240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 431421240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694824480).

431421240 is an abundant number, since it is smaller than the sum of its proper divisors (958227720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

431421240 is a wasteful number, since it uses less digits than its factorization.

431421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001 (or 2997 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 431421240 is about 20770.6822227870. The cubic root of 431421240 is about 755.6148902204.

Adding to 431421240 its reverse (42124134), we get a palindrome (473545374).

The spelling of 431421240 in words is "four hundred thirty-one million, four hundred twenty-one thousand, two hundred forty".