139190987 has 8 divisors (see below), whose sum is σ = 149998800. Its totient is φ = 128397600.

The previous prime is 139190983. The next prime is 139191001. The reversal of 139190987 is 789091931.

It is a happy number.

139190987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 139190987 - 2² = 139190983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139190983) 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, 24737 + ... + 29837.

It is an arithmetic number, because the mean of its divisors is an integer number (18749850).

Almost surely, 2^139190987 is an apocalyptic number.

139190987 is a deficient number, since it is larger than the sum of its proper divisors (10807813).

139190987 is a wasteful number, since it uses less digits than its factorization.

139190987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7213.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 139190987 is about 11797.9229951717. The cubic root of 139190987 is about 518.2472880493.

The spelling of 139190987 in words is "one hundred thirty-nine million, one hundred ninety thousand, nine hundred eighty-seven".