139697799 has 4 divisors (see below), whose sum is σ = 186263736. Its totient is φ = 93131864.

The previous prime is 139697797. The next prime is 139697807. The reversal of 139697799 is 997796931.

139697799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 997796931 = 3 ⋅332598977.

It is a cyclic number.

It is not a de Polignac number, because 139697799 - 2¹ = 139697797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139697797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23282964 + ... + 23282969.

It is an arithmetic number, because the mean of its divisors is an integer number (46565934).

Almost surely, 2^139697799 is an apocalyptic number.

139697799 is a deficient number, since it is larger than the sum of its proper divisors (46565937).

139697799 is an equidigital number, since it uses as much as digits as its factorization.

139697799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46565936.

The product of its digits is 5786802, while the sum is 60.

The square root of 139697799 is about 11819.3823442682. The cubic root of 139697799 is about 518.8755274875.

The spelling of 139697799 in words is "one hundred thirty-nine million, six hundred ninety-seven thousand, seven hundred ninety-nine".