139936457 has 2 divisors, whose sum is σ = 139936458. Its totient is φ = 139936456.

The previous prime is 139936453. The next prime is 139936471. The reversal of 139936457 is 754639931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106110601 + 33825856 = 10301^2 + 5816^2 .

It is an emirp because it is prime and its reverse (754639931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139936457 - 2² = 139936453 is a prime.

It is not a weakly prime, because it can be changed into another prime (139936451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69968228 + 69968229.

It is an arithmetic number, because the mean of its divisors is an integer number (69968229).

Almost surely, 2^139936457 is an apocalyptic number.

It is an amenable number.

139936457 is a deficient number, since it is larger than the sum of its proper divisors (1).

139936457 is an equidigital number, since it uses as much as digits as its factorization.

139936457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 47.

The square root of 139936457 is about 11829.4740796030. The cubic root of 139936457 is about 519.1708395699.

The spelling of 139936457 in words is "one hundred thirty-nine million, nine hundred thirty-six thousand, four hundred fifty-seven".