139294487 has 2 divisors, whose sum is σ = 139294488. Its totient is φ = 139294486.

The previous prime is 139294451. The next prime is 139294559. The reversal of 139294487 is 784492931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139294487 - 2⁶ = 139294423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139294427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69647243 + 69647244.

It is an arithmetic number, because the mean of its divisors is an integer number (69647244).

Almost surely, 2^139294487 is an apocalyptic number.

139294487 is a deficient number, since it is larger than the sum of its proper divisors (1).

139294487 is an equidigital number, since it uses as much as digits as its factorization.

139294487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 139294487 is about 11802.3085453652. The cubic root of 139294487 is about 518.3757094508.

The spelling of 139294487 in words is "one hundred thirty-nine million, two hundred ninety-four thousand, four hundred eighty-seven".