138262890 has 32 divisors (see below), whose sum is σ = 346260096. Its totient is φ = 35266880.

The previous prime is 138262889. The next prime is 138262919. The reversal of 138262890 is 98262831.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99501 + ... + 100880.

It is an arithmetic number, because the mean of its divisors is an integer number (10820628).

Almost surely, 2^138262890 is an apocalyptic number.

138262890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138262890 is an abundant number, since it is smaller than the sum of its proper divisors (207997206).

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

138262890 is a wasteful number, since it uses less digits than its factorization.

138262890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200414.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 138262890 is about 11758.5241420852. The cubic root of 138262890 is about 517.0928628116.

The spelling of 138262890 in words is "one hundred thirty-eight million, two hundred sixty-two thousand, eight hundred ninety".