774378138 has 16 divisors (see below), whose sum is σ = 1552440096. Its totient is φ = 257512080.

The previous prime is 774378113. The next prime is 774378139. The reversal of 774378138 is 831873477.

It is a happy number.

It is a super-2 number, since 2×774378138² = 1199323001224694088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (774378139) 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, 150756 + ... + 155807.

It is an arithmetic number, because the mean of its divisors is an integer number (97027506).

Almost surely, 2^774378138 is an apocalyptic number.

774378138 is an abundant number, since it is smaller than the sum of its proper divisors (778061958).

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

774378138 is a wasteful number, since it uses less digits than its factorization.

774378138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306989.

The product of its digits is 790272, while the sum is 48.

The square root of 774378138 is about 27827.6506015150. The cubic root of 774378138 is about 918.2995282331.

The spelling of 774378138 in words is "seven hundred seventy-four million, three hundred seventy-eight thousand, one hundred thirty-eight".