138747774 has 64 divisors (see below), whose sum is σ = 317882880. Its totient is φ = 39984000.

The previous prime is 138747769. The next prime is 138747781. The reversal of 138747774 is 477747831.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135384 + ... + 136404.

It is an arithmetic number, because the mean of its divisors is an integer number (4966920).

Almost surely, 2^138747774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138747774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158941440).

138747774 is an abundant number, since it is smaller than the sum of its proper divisors (179135106).

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

138747774 is a wasteful number, since it uses less digits than its factorization.

138747774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137.

The product of its digits is 921984, while the sum is 48.

The square root of 138747774 is about 11779.1245005730. The cubic root of 138747774 is about 517.6966341836.

The spelling of 138747774 in words is "one hundred thirty-eight million, seven hundred forty-seven thousand, seven hundred seventy-four".