139999973 has 2 divisors, whose sum is σ = 139999974. Its totient is φ = 139999972.

The previous prime is 139999967. The next prime is 139999991. The reversal of 139999973 is 379999931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101646724 + 38353249 = 10082^2 + 6193^2 .

It is a cyclic number.

It is not a de Polignac number, because 139999973 - 2⁴ = 139999957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139999903) 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, 69999986 + 69999987.

It is an arithmetic number, because the mean of its divisors is an integer number (69999987).

Almost surely, 2^139999973 is an apocalyptic number.

It is an amenable number.

139999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

139999973 is an equidigital number, since it uses as much as digits as its factorization.

139999973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3720087, while the sum is 59.

The square root of 139999973 is about 11832.1584252409. The cubic root of 139999973 is about 519.2493768048.

The spelling of 139999973 in words is "one hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-three".