138774456 has 96 divisors (see below), whose sum is σ = 400757760. Its totient is φ = 43281216.

The previous prime is 138774439. The next prime is 138774473. The reversal of 138774456 is 654477831.

138774456 is a `hidden beast` number, since 138 + 77 + 445 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (138774439) and next prime (138774473).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76941 + ... + 78723.

It is an arithmetic number, because the mean of its divisors is an integer number (4174560).

Almost surely, 2^138774456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138774456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200378880).

138774456 is an abundant number, since it is smaller than the sum of its proper divisors (261983304).

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

138774456 is a wasteful number, since it uses less digits than its factorization.

138774456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865 (or 1858 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 138774456 is about 11780.2570430360. The cubic root of 138774456 is about 517.7298174096.

The spelling of 138774456 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, four hundred fifty-six".