138690758 has 8 divisors (see below), whose sum is σ = 209092752. Its totient is φ = 68993176.

The previous prime is 138690757. The next prime is 138690767. The reversal of 138690758 is 857096831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×138690758² = 38470252709229128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138690757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175610 + ... + 176397.

It is an arithmetic number, because the mean of its divisors is an integer number (26136594).

Almost surely, 2^138690758 is an apocalyptic number.

138690758 is a deficient number, since it is larger than the sum of its proper divisors (70401994).

138690758 is a wasteful number, since it uses less digits than its factorization.

138690758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352206.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 138690758 is about 11776.7040380575. The cubic root of 138690758 is about 517.6257116394.

The spelling of 138690758 in words is "one hundred thirty-eight million, six hundred ninety thousand, seven hundred fifty-eight".