431389240 has 32 divisors (see below), whose sum is σ = 972906480. Its totient is φ = 172150272.

The previous prime is 431389187. The next prime is 431389241. The reversal of 431389240 is 42983134.

It is a junction number, because it is equal to n+sod(n) for n = 431389196 and 431389205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431389241) 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, 4867 + ... + 29773.

Almost surely, 2^431389240 is an apocalyptic number.

431389240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

431389240 is an abundant number, since it is smaller than the sum of its proper divisors (541517240).

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

431389240 is a wasteful number, since it uses less digits than its factorization.

431389240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25351 (or 25347 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 431389240 is about 20769.9118919653. The cubic root of 431389240 is about 755.5962075718.

The spelling of 431389240 in words is "four hundred thirty-one million, three hundred eighty-nine thousand, two hundred forty".