138891396 has 24 divisors (see below), whose sum is σ = 370377280. Its totient is φ = 39683232.

The previous prime is 138891359. The next prime is 138891409. The reversal of 138891396 is 693198831.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 826651 + ... + 826818.

Almost surely, 2^138891396 is an apocalyptic number.

It is an amenable number.

138891396 is an abundant number, since it is smaller than the sum of its proper divisors (231485884).

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

138891396 is a wasteful number, since it uses less digits than its factorization.

138891396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653483 (or 1653481 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 138891396 is about 11785.2193870119. The cubic root of 138891396 is about 517.8752003777.

The spelling of 138891396 in words is "one hundred thirty-eight million, eight hundred ninety-one thousand, three hundred ninety-six".