138051806 has 4 divisors (see below), whose sum is σ = 207077712. Its totient is φ = 69025902.

The previous prime is 138051779. The next prime is 138051811. The reversal of 138051806 is 608150831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608150831 = 103 ⋅5904377.

It is a super-2 number, since 2×138051806² = 38116602279723272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34512950 + ... + 34512953.

It is an arithmetic number, because the mean of its divisors is an integer number (51769428).

Almost surely, 2^138051806 is an apocalyptic number.

138051806 is a deficient number, since it is larger than the sum of its proper divisors (69025906).

138051806 is an equidigital number, since it uses as much as digits as its factorization.

138051806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69025905.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 138051806 is about 11749.5449273578. The cubic root of 138051806 is about 516.8295826623.

The spelling of 138051806 in words is "one hundred thirty-eight million, fifty-one thousand, eight hundred six".