139091989 has 8 divisors (see below), whose sum is σ = 147385280. Its totient is φ = 130896000.

The previous prime is 139091983. The next prime is 139091999. The reversal of 139091989 is 989190931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139091989 - 2¹¹ = 139089941 is a prime.

It is a super-2 number, since 2×139091989² = 38693162807952242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139091983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21372 + ... + 27109.

It is an arithmetic number, because the mean of its divisors is an integer number (18423160).

Almost surely, 2^139091989 is an apocalyptic number.

139091989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

139091989 is a deficient number, since it is larger than the sum of its proper divisors (8293291).

139091989 is a wasteful number, since it uses less digits than its factorization.

139091989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48651.

The product of its (nonzero) digits is 157464, while the sum is 49.

The square root of 139091989 is about 11793.7266798922. The cubic root of 139091989 is about 518.1243930870.

The spelling of 139091989 in words is "one hundred thirty-nine million, ninety-one thousand, nine hundred eighty-nine".