138155394 has 16 divisors (see below), whose sum is σ = 297565632. Its totient is φ = 42509328.

The previous prime is 138155393. The next prime is 138155401. The reversal of 138155394 is 493551831.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (138155393) 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, 885534 + ... + 885689.

It is an arithmetic number, because the mean of its divisors is an integer number (18597852).

Almost surely, 2^138155394 is an apocalyptic number.

138155394 is an abundant number, since it is smaller than the sum of its proper divisors (159410238).

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

138155394 is a wasteful number, since it uses less digits than its factorization.

138155394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771241.

The product of its digits is 64800, while the sum is 39.

The square root of 138155394 is about 11753.9522714702. The cubic root of 138155394 is about 516.9588190682.

The spelling of 138155394 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, three hundred ninety-four".