139694989 has 16 divisors (see below), whose sum is σ = 162803200. Its totient is φ = 117396864.

The previous prime is 139694987. The next prime is 139694993. The reversal of 139694989 is 989496931.

It is a cyclic number.

It is not a de Polignac number, because 139694989 - 2¹ = 139694987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139694983) 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 15 ways as a sum of consecutive naturals, for example, 86017 + ... + 87625.

It is an arithmetic number, because the mean of its divisors is an integer number (10175200).

Almost surely, 2^139694989 is an apocalyptic number.

It is an amenable number.

139694989 is a deficient number, since it is larger than the sum of its proper divisors (23108211).

139694989 is a wasteful number, since it uses less digits than its factorization.

139694989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852.

The product of its digits is 3779136, while the sum is 58.

The square root of 139694989 is about 11819.2634711305. The cubic root of 139694989 is about 518.8720484301.

The spelling of 139694989 in words is "one hundred thirty-nine million, six hundred ninety-four thousand, nine hundred eighty-nine".