139973465 has 4 divisors (see below), whose sum is σ = 167968164. Its totient is φ = 111978768.

The previous prime is 139973453. The next prime is 139973489. The reversal of 139973465 is 564379931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564379931 = 3119 ⋅180949.

It can be written as a sum of positive squares in 2 ways, for example, as 15784729 + 124188736 = 3973^2 + 11144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139973465 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13997342 + ... + 13997351.

It is an arithmetic number, because the mean of its divisors is an integer number (41992041).

Almost surely, 2^139973465 is an apocalyptic number.

It is an amenable number.

139973465 is a deficient number, since it is larger than the sum of its proper divisors (27994699).

139973465 is an equidigital number, since it uses as much as digits as its factorization.

139973465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27994698.

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

The square root of 139973465 is about 11831.0382046547. The cubic root of 139973465 is about 519.2166026763.

The spelling of 139973465 in words is "one hundred thirty-nine million, nine hundred seventy-three thousand, four hundred sixty-five".