781376238 has 12 divisors (see below), whose sum is σ = 1692981888. Its totient is φ = 260458740.

The previous prime is 781376213. The next prime is 781376243. The reversal of 781376238 is 832673187.

781376238 is a `hidden beast` number, since 7 + 8 + 13 + 7 + 623 + 8 = 666.

It is a super-2 number, since 2×781376238² = 1221097650622065288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 781376193 and 781376202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21704878 + ... + 21704913.

It is an arithmetic number, because the mean of its divisors is an integer number (141081824).

Almost surely, 2^781376238 is an apocalyptic number.

781376238 is an abundant number, since it is smaller than the sum of its proper divisors (911605650).

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

781376238 is a wasteful number, since it uses less digits than its factorization.

781376238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43409799 (or 43409796 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 781376238 is about 27953.1078415263. The cubic root of 781376238 is about 921.0574788971.

The spelling of 781376238 in words is "seven hundred eighty-one million, three hundred seventy-six thousand, two hundred thirty-eight".