72405479 has 2 divisors, whose sum is σ = 72405480. Its totient is φ = 72405478.

The previous prime is 72405451. The next prime is 72405481. The reversal of 72405479 is 97450427.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72405479 - 2²⁰ = 71356903 is a prime.

It is a Sophie Germain prime.

Together with 72405481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72405419) 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, 36202739 + 36202740.

It is an arithmetic number, because the mean of its divisors is an integer number (36202740).

Almost surely, 2^72405479 is an apocalyptic number.

72405479 is a deficient number, since it is larger than the sum of its proper divisors (1).

72405479 is an equidigital number, since it uses as much as digits as its factorization.

72405479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 72405479 is about 8509.1409084584. The cubic root of 72405479 is about 416.7962571487.

The spelling of 72405479 in words is "seventy-two million, four hundred five thousand, four hundred seventy-nine".