139085399 has 2 divisors, whose sum is σ = 139085400. Its totient is φ = 139085398.

The previous prime is 139085311. The next prime is 139085413. The reversal of 139085399 is 993580931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139085399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139085299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69542699 + 69542700.

It is an arithmetic number, because the mean of its divisors is an integer number (69542700).

Almost surely, 2^139085399 is an apocalyptic number.

139085399 is a deficient number, since it is larger than the sum of its proper divisors (1).

139085399 is an equidigital number, since it uses as much as digits as its factorization.

139085399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 139085399 is about 11793.4472907628. The cubic root of 139085399 is about 518.1162102681.

The spelling of 139085399 in words is "one hundred thirty-nine million, eighty-five thousand, three hundred ninety-nine".