381486951990 has 64 divisors (see below), whose sum is σ = 1021166784000. Its totient is φ = 101343029472.

The previous prime is 381486951887. The next prime is 381486952003. The reversal of 381486951990 is 99159684183.

381486951990 is a `hidden beast` number, since 38 + 1 + 4 + 86 + 9 + 519 + 9 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2615140 + ... + 2757159.

It is an arithmetic number, because the mean of its divisors is an integer number (15955731000).

Almost surely, 2^381486951990 is an apocalyptic number.

381486951990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

381486951990 is an abundant number, since it is smaller than the sum of its proper divisors (639679832010).

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

381486951990 is a wasteful number, since it uses less digits than its factorization.

381486951990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5372578 (or 5372572 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 63.

The spelling of 381486951990 in words is "three hundred eighty-one billion, four hundred eighty-six million, nine hundred fifty-one thousand, nine hundred ninety".