15220379 has 2 divisors, whose sum is σ = 15220380. Its totient is φ = 15220378.

The previous prime is 15220333. The next prime is 15220391. The reversal of 15220379 is 97302251.

It is a strong prime.

It is an emirp because it is prime and its reverse (97302251) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15220379 is a prime.

It is not a weakly prime, because it can be changed into another prime (15220979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610189 + 7610190.

It is an arithmetic number, because the mean of its divisors is an integer number (7610190).

Almost surely, 2^15220379 is an apocalyptic number.

15220379 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220379 is an equidigital number, since it uses as much as digits as its factorization.

15220379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 15220379 is about 3901.3304141023. The cubic root of 15220379 is about 247.8231211447.

The spelling of 15220379 in words is "fifteen million, two hundred twenty thousand, three hundred seventy-nine".