380818261 has 4 divisors (see below), whose sum is σ = 381376512. Its totient is φ = 380260012.

The previous prime is 380818259. The next prime is 380818271. The reversal of 380818261 is 162818083.

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, and also an emirpimes, since its reverse is a distinct semiprime: 162818083 = 3373 ⋅48271.

It is a cyclic number.

It is not a de Polignac number, because 380818261 - 2¹ = 380818259 is a prime.

It is a super-2 number, since 2×380818261² = 290045095822128242, 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 380818261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (380818201) 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, 278101 + ... + 279466.

It is an arithmetic number, because the mean of its divisors is an integer number (95344128).

Almost surely, 2^380818261 is an apocalyptic number.

It is an amenable number.

380818261 is a deficient number, since it is larger than the sum of its proper divisors (558251).

380818261 is an equidigital number, since it uses as much as digits as its factorization.

380818261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558250.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 380818261 is about 19514.5653551392. The cubic root of 380818261 is about 724.8351656973.

The spelling of 380818261 in words is "three hundred eighty million, eight hundred eighteen thousand, two hundred sixty-one".