139869989 has 4 divisors (see below), whose sum is σ = 159851424. Its totient is φ = 119888556.

The previous prime is 139869911. The next prime is 139869991. The reversal of 139869989 is 989968931.

139869989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139869989 - 2²⁰ = 138821413 is a prime.

It is a super-2 number, since 2×139869989² = 39127227645720242, 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 (139869689) 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, 9990707 + ... + 9990720.

It is an arithmetic number, because the mean of its divisors is an integer number (39962856).

Almost surely, 2^139869989 is an apocalyptic number.

It is an amenable number.

139869989 is a deficient number, since it is larger than the sum of its proper divisors (19981435).

139869989 is an equidigital number, since it uses as much as digits as its factorization.

139869989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19981434.

The product of its digits is 7558272, while the sum is 62.

The square root of 139869989 is about 11826.6643226228. The cubic root of 139869989 is about 519.0886267494.

The spelling of 139869989 in words is "one hundred thirty-nine million, eight hundred sixty-nine thousand, nine hundred eighty-nine".