139491047 has 4 divisors (see below), whose sum is σ = 139519080. Its totient is φ = 139463016.

The previous prime is 139491043. The next prime is 139491059. The reversal of 139491047 is 740194931.

139491047 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.

It is a cyclic number.

It is not a de Polignac number, because 139491047 - 2² = 139491043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139491047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139491043) 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, 4313 + ... + 17250.

It is an arithmetic number, because the mean of its divisors is an integer number (34879770).

Almost surely, 2^139491047 is an apocalyptic number.

139491047 is a deficient number, since it is larger than the sum of its proper divisors (28033).

139491047 is an equidigital number, since it uses as much as digits as its factorization.

139491047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28032.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 139491047 is about 11810.6327942240. The cubic root of 139491047 is about 518.6194234275.

The spelling of 139491047 in words is "one hundred thirty-nine million, four hundred ninety-one thousand, forty-seven".