139078465 has 4 divisors (see below), whose sum is σ = 166894164. Its totient is φ = 111262768.

The previous prime is 139078463. The next prime is 139078477. The reversal of 139078465 is 564870931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564870931 = 19 ⋅29730049.

It can be written as a sum of positive squares in 2 ways, for example, as 38738176 + 100340289 = 6224^2 + 10017^2 .

It is a cyclic number.

It is not a de Polignac number, because 139078465 - 2¹ = 139078463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139078463) 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, 13907842 + ... + 13907851.

It is an arithmetic number, because the mean of its divisors is an integer number (41723541).

Almost surely, 2^139078465 is an apocalyptic number.

It is an amenable number.

139078465 is a deficient number, since it is larger than the sum of its proper divisors (27815699).

139078465 is an equidigital number, since it uses as much as digits as its factorization.

139078465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27815698.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 139078465 is about 11793.1533102898. The cubic root of 139078465 is about 518.1076000245.

The spelling of 139078465 in words is "one hundred thirty-nine million, seventy-eight thousand, four hundred sixty-five".