818000381 has 4 divisors (see below), whose sum is σ = 892364064. Its totient is φ = 743636700.

The previous prime is 818000377. The next prime is 818000383. The reversal of 818000381 is 183000818.

It is a happy number.

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 818000381 - 2² = 818000377 is a prime.

It is a super-2 number, since 2×818000381² = 1338249246632290322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818000383) 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, 37181825 + ... + 37181846.

It is an arithmetic number, because the mean of its divisors is an integer number (223091016).

Almost surely, 2^818000381 is an apocalyptic number.

It is an amenable number.

818000381 is a deficient number, since it is larger than the sum of its proper divisors (74363683).

818000381 is a wasteful number, since it uses less digits than its factorization.

818000381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74363682.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 818000381 is about 28600.7059528257. The cubic root of 818000381 is about 935.2287203904.

The spelling of 818000381 in words is "eight hundred eighteen million, three hundred eighty-one", and thus it is an aban number.