381720188 has 12 divisors (see below), whose sum is σ = 678961752. Its totient is φ = 187731120.

The previous prime is 381720173. The next prime is 381720191. The reversal of 381720188 is 881027183.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781970 + ... + 782457.

It is an arithmetic number, because the mean of its divisors is an integer number (56580146).

Almost surely, 2^381720188 is an apocalyptic number.

It is an amenable number.

381720188 is a deficient number, since it is larger than the sum of its proper divisors (297241564).

381720188 is a wasteful number, since it uses less digits than its factorization.

381720188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564492 (or 1564490 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 381720188 is about 19537.6607606950. The cubic root of 381720188 is about 725.4069458530.

The spelling of 381720188 in words is "three hundred eighty-one million, seven hundred twenty thousand, one hundred eighty-eight".