381766911988 has 48 divisors (see below), whose sum is σ = 837760823424. Its totient is φ = 147880563840.

The previous prime is 381766911983. The next prime is 381766911989. The reversal of 381766911988 is 889119667183.

It is a happy number.

It is a super-2 number, since 2×381766911988² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381766911983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3529095 + ... + 3635662.

It is an arithmetic number, because the mean of its divisors is an integer number (17453350488).

Almost surely, 2^381766911988 is an apocalyptic number.

It is an amenable number.

381766911988 is an abundant number, since it is smaller than the sum of its proper divisors (455993911436).

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

381766911988 is a wasteful number, since it uses less digits than its factorization.

381766911988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164952 (or 7164950 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 67.

The spelling of 381766911988 in words is "three hundred eighty-one billion, seven hundred sixty-six million, nine hundred eleven thousand, nine hundred eighty-eight".