139278299 has 2 divisors, whose sum is σ = 139278300. Its totient is φ = 139278298.

The previous prime is 139278287. The next prime is 139278361. The reversal of 139278299 is 992872931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139278299 - 2¹² = 139274203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139278199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69639149 + 69639150.

It is an arithmetic number, because the mean of its divisors is an integer number (69639150).

Almost surely, 2^139278299 is an apocalyptic number.

139278299 is a deficient number, since it is larger than the sum of its proper divisors (1).

139278299 is an equidigital number, since it uses as much as digits as its factorization.

139278299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 139278299 is about 11801.6227274049. The cubic root of 139278299 is about 518.3556277969.

The spelling of 139278299 in words is "one hundred thirty-nine million, two hundred seventy-eight thousand, two hundred ninety-nine".