139865417 has 4 divisors (see below), whose sum is σ = 140080260. Its totient is φ = 139650576.

The previous prime is 139865413. The next prime is 139865431. The reversal of 139865417 is 714568931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 714568931 = 2713 ⋅263387.

It can be written as a sum of positive squares in 2 ways, for example, as 56490256 + 83375161 = 7516^2 + 9131^2 .

It is a cyclic number.

It is not a de Polignac number, because 139865417 - 2² = 139865413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139865413) 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, 106442 + ... + 107747.

It is an arithmetic number, because the mean of its divisors is an integer number (35020065).

Almost surely, 2^139865417 is an apocalyptic number.

It is an amenable number.

139865417 is a deficient number, since it is larger than the sum of its proper divisors (214843).

139865417 is an equidigital number, since it uses as much as digits as its factorization.

139865417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214842.

The product of its digits is 181440, while the sum is 44.

The square root of 139865417 is about 11826.4710290095. The cubic root of 139865417 is about 519.0829707849.

The spelling of 139865417 in words is "one hundred thirty-nine million, eight hundred sixty-five thousand, four hundred seventeen".