139447493 has 2 divisors, whose sum is σ = 139447494. Its totient is φ = 139447492.

The previous prime is 139447453. The next prime is 139447499. The reversal of 139447493 is 394744931.

139447493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94517284 + 44930209 = 9722^2 + 6703^2 .

It is a cyclic number.

It is not a de Polignac number, because 139447493 - 2¹⁰ = 139446469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139447499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69723746 + 69723747.

It is an arithmetic number, because the mean of its divisors is an integer number (69723747).

Almost surely, 2^139447493 is an apocalyptic number.

It is an amenable number.

139447493 is a deficient number, since it is larger than the sum of its proper divisors (1).

139447493 is an equidigital number, since it uses as much as digits as its factorization.

139447493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 44.

The square root of 139447493 is about 11808.7888032601. The cubic root of 139447493 is about 518.5654407474.

The spelling of 139447493 in words is "one hundred thirty-nine million, four hundred forty-seven thousand, four hundred ninety-three".