778494943 has 4 divisors (see below), whose sum is σ = 780268720. Its totient is φ = 776721168.

The previous prime is 778494901. The next prime is 778494953. The reversal of 778494943 is 349494877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 349494877 = 1493 ⋅234089.

It is a cyclic number.

It is not a de Polignac number, because 778494943 - 2¹⁷ = 778363871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778494953) 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, 886230 + ... + 887107.

It is an arithmetic number, because the mean of its divisors is an integer number (195067180).

Almost surely, 2^778494943 is an apocalyptic number.

778494943 is a deficient number, since it is larger than the sum of its proper divisors (1773777).

778494943 is a wasteful number, since it uses less digits than its factorization.

778494943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773776.

The product of its digits is 6096384, while the sum is 55.

The square root of 778494943 is about 27901.5222344588. The cubic root of 778494943 is about 919.9239630762.

The spelling of 778494943 in words is "seven hundred seventy-eight million, four hundred ninety-four thousand, nine hundred forty-three".