138892443 has 4 divisors (see below), whose sum is σ = 185189928. Its totient is φ = 92594960.

The previous prime is 138892427. The next prime is 138892459. The reversal of 138892443 is 344298831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344298831 = 3 ⋅114766277.

It is an interprime number because it is at equal distance from previous prime (138892427) and next prime (138892459).

It is a cyclic number.

It is not a de Polignac number, because 138892443 - 2⁴ = 138892427 is a prime.

It is a super-2 number, since 2×138892443² = 38582221445016498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138892395 and 138892404.

It is not an unprimeable number, because it can be changed into a prime (138892343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23148738 + ... + 23148743.

It is an arithmetic number, because the mean of its divisors is an integer number (46297482).

Almost surely, 2^138892443 is an apocalyptic number.

138892443 is a deficient number, since it is larger than the sum of its proper divisors (46297485).

138892443 is an equidigital number, since it uses as much as digits as its factorization.

138892443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46297484.

The product of its digits is 165888, while the sum is 42.

The square root of 138892443 is about 11785.2638069752. The cubic root of 138892443 is about 517.8765016678.

The spelling of 138892443 in words is "one hundred thirty-eight million, eight hundred ninety-two thousand, four hundred forty-three".