1431397688 has 64 divisors (see below), whose sum is σ = 3335567040. Its totient is φ = 561752064.

The previous prime is 1431397687. The next prime is 1431397691. The reversal of 1431397688 is 8867931341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431397687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14906 + ... + 55542.

It is an arithmetic number, because the mean of its divisors is an integer number (52118235).

Almost surely, 2^1431397688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1431397688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1667783520).

1431397688 is an abundant number, since it is smaller than the sum of its proper divisors (1904169352).

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

1431397688 is a wasteful number, since it uses less digits than its factorization.

1431397688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40704 (or 40700 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The square root of 1431397688 is about 37833.8167252526. The cubic root of 1431397688 is about 1126.9901072172.

The spelling of 1431397688 in words is "one billion, four hundred thirty-one million, three hundred ninety-seven thousand, six hundred eighty-eight".