139198823 has 2 divisors, whose sum is σ = 139198824. Its totient is φ = 139198822.

The previous prime is 139198793. The next prime is 139198841. The reversal of 139198823 is 328891931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139198823 - 2²⁶ = 72089959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139194823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69599411 + 69599412.

It is an arithmetic number, because the mean of its divisors is an integer number (69599412).

Almost surely, 2^139198823 is an apocalyptic number.

139198823 is a deficient number, since it is larger than the sum of its proper divisors (1).

139198823 is an equidigital number, since it uses as much as digits as its factorization.

139198823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 139198823 is about 11798.2550828502. The cubic root of 139198823 is about 518.2570130792.

The spelling of 139198823 in words is "one hundred thirty-nine million, one hundred ninety-eight thousand, eight hundred twenty-three".