381897840 has 40 divisors (see below), whose sum is σ = 1183884048. Its totient is φ = 101839360.

The previous prime is 381897833. The next prime is 381897863. The reversal of 381897840 is 48798183.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 381897840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795381 + ... + 795860.

Almost surely, 2^381897840 is an apocalyptic number.

381897840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

381897840 is an abundant number, since it is smaller than the sum of its proper divisors (801986208).

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

381897840 is a wasteful number, since it uses less digits than its factorization.

381897840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591257 (or 1591251 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 381897840 is about 19542.2066307774. The cubic root of 381897840 is about 725.5194628327.

The spelling of 381897840 in words is "three hundred eighty-one million, eight hundred ninety-seven thousand, eight hundred forty".