280397379 has 4 divisors (see below), whose sum is σ = 373863176. Its totient is φ = 186931584.

The previous prime is 280397363. The next prime is 280397423. The reversal of 280397379 is 973793082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 280397379 - 2⁴ = 280397363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280397179) 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, 46732894 + ... + 46732899.

It is an arithmetic number, because the mean of its divisors is an integer number (93465794).

Almost surely, 2^280397379 is an apocalyptic number.

280397379 is a deficient number, since it is larger than the sum of its proper divisors (93465797).

280397379 is an equidigital number, since it uses as much as digits as its factorization.

280397379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93465796.

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 280397379 is about 16745.0702894912. The cubic root of 280397379 is about 654.5226045667.

The spelling of 280397379 in words is "two hundred eighty million, three hundred ninety-seven thousand, three hundred seventy-nine".