781097438 has 16 divisors (see below), whose sum is σ = 1290818160. Its totient is φ = 351528000.

The previous prime is 781097407. The next prime is 781097461. The reversal of 781097438 is 834790187.

It is a super-2 number, since 2×781097438² = 1220226415300327688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781097392 and 781097401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173543 + ... + 177986.

It is an arithmetic number, because the mean of its divisors is an integer number (80676135).

Almost surely, 2^781097438 is an apocalyptic number.

781097438 is a deficient number, since it is larger than the sum of its proper divisors (509720722).

781097438 is a wasteful number, since it uses less digits than its factorization.

781097438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351643.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 781097438 is about 27948.1204734773. The cubic root of 781097438 is about 920.9479194812.

The spelling of 781097438 in words is "seven hundred eighty-one million, ninety-seven thousand, four hundred thirty-eight".