138893656 has 32 divisors (see below), whose sum is σ = 284760000. Its totient is φ = 62987040.

The previous prime is 138893653. The next prime is 138893659. The reversal of 138893656 is 656398831.

It is an interprime number because it is at equal distance from previous prime (138893653) and next prime (138893659).

It is a super-3 number, since 3×138893656³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138893653) 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, 42331 + ... + 45493.

It is an arithmetic number, because the mean of its divisors is an integer number (8898750).

Almost surely, 2^138893656 is an apocalyptic number.

It is an amenable number.

138893656 is an abundant number, since it is smaller than the sum of its proper divisors (145866344).

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

138893656 is a wasteful number, since it uses less digits than its factorization.

138893656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679 (or 3675 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 138893656 is about 11785.3152694359. The cubic root of 138893656 is about 517.8780092669.

The spelling of 138893656 in words is "one hundred thirty-eight million, eight hundred ninety-three thousand, six hundred fifty-six".