380818643 has 4 divisors (see below), whose sum is σ = 380885400. Its totient is φ = 380751888.

The previous prime is 380818637. The next prime is 380818657. The reversal of 380818643 is 346818083.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346818083 = 401 ⋅864883.

It is a cyclic number.

It is not a de Polignac number, because 380818643 - 2¹⁸ = 380556499 is a prime.

It is a super-2 number, since 2×380818643² = 290045677712722898, 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 380818643.

It is not an unprimeable number, because it can be changed into a prime (380811643) 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, 23930 + ... + 36527.

It is an arithmetic number, because the mean of its divisors is an integer number (95221350).

Almost surely, 2^380818643 is an apocalyptic number.

380818643 is a deficient number, since it is larger than the sum of its proper divisors (66757).

380818643 is an equidigital number, since it uses as much as digits as its factorization.

380818643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66756.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 380818643 is about 19514.5751426978. The cubic root of 380818643 is about 724.8354080587.

The spelling of 380818643 in words is "three hundred eighty million, eight hundred eighteen thousand, six hundred forty-three".