139400189 has 4 divisors (see below), whose sum is σ = 141685500. Its totient is φ = 137114880.

The previous prime is 139400137. The next prime is 139400197. The reversal of 139400189 is 981004931.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33988900 + 105411289 = 5830^2 + 10267^2 .

It is a cyclic number.

It is not a de Polignac number, because 139400189 - 2⁸ = 139399933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139400089) 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, 1142564 + ... + 1142685.

It is an arithmetic number, because the mean of its divisors is an integer number (35421375).

Almost surely, 2^139400189 is an apocalyptic number.

It is an amenable number.

139400189 is a deficient number, since it is larger than the sum of its proper divisors (2285311).

139400189 is an equidigital number, since it uses as much as digits as its factorization.

139400189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285310.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 139400189 is about 11806.7857183909. The cubic root of 139400189 is about 518.5067974226.

The spelling of 139400189 in words is "one hundred thirty-nine million, four hundred thousand, one hundred eighty-nine".