781434957 has 16 divisors (see below), whose sum is σ = 1090837440. Its totient is φ = 496927872.

The previous prime is 781434947. The next prime is 781434961. The reversal of 781434957 is 759434187.

It is a happy number.

It is not a de Polignac number, because 781434957 - 2⁶ = 781434893 is a prime.

It is a super-2 number, since 2×781434957² = 1221281184043183698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781434947) 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, 46888 + ... + 61329.

It is an arithmetic number, because the mean of its divisors is an integer number (68177340).

Almost surely, 2^781434957 is an apocalyptic number.

It is an amenable number.

781434957 is a deficient number, since it is larger than the sum of its proper divisors (309402483).

781434957 is a wasteful number, since it uses less digits than its factorization.

781434957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108332.

The product of its digits is 846720, while the sum is 48.

The square root of 781434957 is about 27954.1581343456. The cubic root of 781434957 is about 921.0805502494.

The spelling of 781434957 in words is "seven hundred eighty-one million, four hundred thirty-four thousand, nine hundred fifty-seven".