778135942 has 4 divisors (see below), whose sum is σ = 1167203916. Its totient is φ = 389067970.

The previous prime is 778135921. The next prime is 778135957. The reversal of 778135942 is 249531877.

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

It is a junction number, because it is equal to n+sod(n) for n = 778135892 and 778135901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194533984 + ... + 194533987.

It is an arithmetic number, because the mean of its divisors is an integer number (291800979).

Almost surely, 2^778135942 is an apocalyptic number.

778135942 is a deficient number, since it is larger than the sum of its proper divisors (389067974).

778135942 is a wasteful number, since it uses less digits than its factorization.

778135942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389067973.

The product of its digits is 423360, while the sum is 46.

The square root of 778135942 is about 27895.0881339350. The cubic root of 778135942 is about 919.7825344543.

The spelling of 778135942 in words is "seven hundred seventy-eight million, one hundred thirty-five thousand, nine hundred forty-two".