774139691 has 8 divisors (see below), whose sum is σ = 841338960. Its totient is φ = 708033312.

The previous prime is 774139687. The next prime is 774139697. The reversal of 774139691 is 196931477.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 774139691 - 2² = 774139687 is a prime.

It is a super-2 number, since 2×774139691² = 1198584522363150962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (774139697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271745 + ... + 274578.

It is an arithmetic number, because the mean of its divisors is an integer number (105167370).

Almost surely, 2^774139691 is an apocalyptic number.

774139691 is a deficient number, since it is larger than the sum of its proper divisors (67199269).

774139691 is a wasteful number, since it uses less digits than its factorization.

774139691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546445.

The product of its digits is 285768, while the sum is 47.

The square root of 774139691 is about 27823.3659178756. The cubic root of 774139691 is about 918.2052641023.

The spelling of 774139691 in words is "seven hundred seventy-four million, one hundred thirty-nine thousand, six hundred ninety-one".