139694977 has 2 divisors, whose sum is σ = 139694978. Its totient is φ = 139694976.

The previous prime is 139694969. The next prime is 139694983. The reversal of 139694977 is 779496931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74666881 + 65028096 = 8641^2 + 8064^2 .

It is a cyclic number.

It is not a de Polignac number, because 139694977 - 2³ = 139694969 is a prime.

It is a super-3 number, since 3×139694977³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (139694987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69847488 + 69847489.

It is an arithmetic number, because the mean of its divisors is an integer number (69847489).

Almost surely, 2^139694977 is an apocalyptic number.

It is an amenable number.

139694977 is a deficient number, since it is larger than the sum of its proper divisors (1).

139694977 is an equidigital number, since it uses as much as digits as its factorization.

139694977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 55.

The square root of 139694977 is about 11819.2629634847. The cubic root of 139694977 is about 518.8720335728.

The spelling of 139694977 in words is "one hundred thirty-nine million, six hundred ninety-four thousand, nine hundred seventy-seven".