381111980 has 12 divisors (see below), whose sum is σ = 800335200. Its totient is φ = 152444784.

The previous prime is 381111979. The next prime is 381111989. The reversal of 381111980 is 89111183.

It is not an unprimeable number, because it can be changed into a prime (381111989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9527780 + ... + 9527819.

It is an arithmetic number, because the mean of its divisors is an integer number (66694600).

Almost surely, 2^381111980 is an apocalyptic number.

It is an amenable number.

381111980 is an abundant number, since it is smaller than the sum of its proper divisors (419223220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381111980 is a wasteful number, since it uses less digits than its factorization.

381111980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19055608 (or 19055606 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 32.

The square root of 381111980 is about 19522.0895398008. The cubic root of 381111980 is about 725.0214690432.

The spelling of 381111980 in words is "three hundred eighty-one million, one hundred eleven thousand, nine hundred eighty".