138262831 has 4 divisors (see below), whose sum is σ = 158014672. Its totient is φ = 118510992.

The previous prime is 138262801. The next prime is 138262837.

It is a happy number.

138262831 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138262831 - 2⁷ = 138262703 is a prime.

It is a super-2 number, since 2×138262831² = 38233220872269122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138262837) 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, 9875910 + ... + 9875923.

It is an arithmetic number, because the mean of its divisors is an integer number (39503668).

Almost surely, 2^138262831 is an apocalyptic number.

138262831 is a deficient number, since it is larger than the sum of its proper divisors (19751841).

138262831 is an equidigital number, since it uses as much as digits as its factorization.

138262831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19751840.

The product of its digits is 13824, while the sum is 34.

The square root of 138262831 is about 11758.5216332667. The cubic root of 138262831 is about 517.0927892597.

The spelling of 138262831 in words is "one hundred thirty-eight million, two hundred sixty-two thousand, eight hundred thirty-one".