380405812 has 24 divisors (see below), whose sum is σ = 670761000. Its totient is φ = 188766336.

The previous prime is 380405807. The next prime is 380405891. The reversal of 380405812 is 218504083.

It can be written as a sum of positive squares in 4 ways, for example, as 5363856 + 375041956 = 2316^2 + 19366^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375018 + ... + 376030.

It is an arithmetic number, because the mean of its divisors is an integer number (27948375).

Almost surely, 2^380405812 is an apocalyptic number.

It is an amenable number.

380405812 is a deficient number, since it is larger than the sum of its proper divisors (290355188).

380405812 is a wasteful number, since it uses less digits than its factorization.

380405812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 380405812 is about 19503.9947703028. The cubic root of 380405812 is about 724.5733911936.

Adding to 380405812 its reverse (218504083), we get a palindrome (598909895).

The spelling of 380405812 in words is "three hundred eighty million, four hundred five thousand, eight hundred twelve".