781880943 has 4 divisors (see below), whose sum is σ = 1042507928. Its totient is φ = 521253960.

The previous prime is 781880941. The next prime is 781880959. The reversal of 781880943 is 349088187.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 781880943 - 2¹ = 781880941 is a prime.

It is a super-2 number, since 2×781880943² = 1222675618053138498, 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 = 781880892 and 781880901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781880941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130313488 + ... + 130313493.

It is an arithmetic number, because the mean of its divisors is an integer number (260626982).

Almost surely, 2^781880943 is an apocalyptic number.

781880943 is a deficient number, since it is larger than the sum of its proper divisors (260626985).

781880943 is a wasteful number, since it uses less digits than its factorization.

781880943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260626984.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 781880943 is about 27962.1340923757. The cubic root of 781880943 is about 921.2557454258.

The spelling of 781880943 in words is "seven hundred eighty-one million, eight hundred eighty thousand, nine hundred forty-three".