431430640 has 40 divisors (see below), whose sum is σ = 1003953600. Its totient is φ = 172421376.

The previous prime is 431430631. The next prime is 431430647. The reversal of 431430640 is 46034134.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×431430640² = 372264794261619200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431430647) 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 7 ways as a sum of consecutive naturals, for example, 154537 + ... + 157303.

It is an arithmetic number, because the mean of its divisors is an integer number (25098840).

Almost surely, 2^431430640 is an apocalyptic number.

431430640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

431430640 is an abundant number, since it is smaller than the sum of its proper divisors (572522960).

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

431430640 is a wasteful number, since it uses less digits than its factorization.

431430640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729 (or 4723 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 431430640 is about 20770.9085020372. The cubic root of 431430640 is about 755.6203780729.

Adding to 431430640 its reverse (46034134), we get a palindrome (477464774).

The spelling of 431430640 in words is "four hundred thirty-one million, four hundred thirty thousand, six hundred forty".