634040431 has 16 divisors (see below), whose sum is σ = 681890400. Its totient is φ = 587703168.

The previous prime is 634040423. The next prime is 634040447. The reversal of 634040431 is 134040436.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 634040431 - 2³ = 634040423 is a prime.

It is a super-2 number, since 2×634040431² = 804014536285331522, 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 = 634040396 and 634040405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634046431) 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, 511945 + ... + 513181.

It is an arithmetic number, because the mean of its divisors is an integer number (42618150).

Almost surely, 2^634040431 is an apocalyptic number.

634040431 is a deficient number, since it is larger than the sum of its proper divisors (47849969).

634040431 is a wasteful number, since it uses less digits than its factorization.

634040431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818.

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

The square root of 634040431 is about 25180.1594712980. The cubic root of 634040431 is about 859.0906337790.

Adding to 634040431 its reverse (134040436), we get a palindrome (768080867).

The spelling of 634040431 in words is "six hundred thirty-four million, forty thousand, four hundred thirty-one".