139764637 has 2 divisors, whose sum is σ = 139764638. Its totient is φ = 139764636.

The previous prime is 139764557. The next prime is 139764641. The reversal of 139764637 is 736467931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128006596 + 11758041 = 11314^2 + 3429^2 .

It is a cyclic number.

It is not a de Polignac number, because 139764637 - 2¹⁹ = 139240349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139714637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69882318 + 69882319.

It is an arithmetic number, because the mean of its divisors is an integer number (69882319).

Almost surely, 2^139764637 is an apocalyptic number.

It is an amenable number.

139764637 is a deficient number, since it is larger than the sum of its proper divisors (1).

139764637 is an equidigital number, since it uses as much as digits as its factorization.

139764637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 46.

The square root of 139764637 is about 11822.2094804651. The cubic root of 139764637 is about 518.9582657823.

The spelling of 139764637 in words is "one hundred thirty-nine million, seven hundred sixty-four thousand, six hundred thirty-seven".