380305981 has 4 divisors (see below), whose sum is σ = 414879264. Its totient is φ = 345732700.

The previous prime is 380305979. The next prime is 380305993. The reversal of 380305981 is 189503083.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 380305981 - 2¹ = 380305979 is a prime.

It is a super-2 number, since 2×380305981² = 289265278368744722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 380305981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (380305931) 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, 17286625 + ... + 17286646.

It is an arithmetic number, because the mean of its divisors is an integer number (103719816).

Almost surely, 2^380305981 is an apocalyptic number.

It is an amenable number.

380305981 is a deficient number, since it is larger than the sum of its proper divisors (34573283).

380305981 is a wasteful number, since it uses less digits than its factorization.

380305981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34573282.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 380305981 is about 19501.4353574295. The cubic root of 380305981 is about 724.5100016829.

The spelling of 380305981 in words is "three hundred eighty million, three hundred five thousand, nine hundred eighty-one".