381398380 has 48 divisors (see below), whose sum is σ = 876750336. Its totient is φ = 138214080.

The previous prime is 381398377. The next prime is 381398431. The reversal of 381398380 is 83893183.

It is a happy number.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64717 + ... + 70363.

It is an arithmetic number, because the mean of its divisors is an integer number (18265632).

Almost surely, 2^381398380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381398380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438375168).

381398380 is an abundant number, since it is smaller than the sum of its proper divisors (495351956).

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

381398380 is a wasteful number, since it uses less digits than its factorization.

381398380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5974 (or 5972 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 381398380 is about 19529.4234425904. The cubic root of 381398380 is about 725.2030378620.

The spelling of 381398380 in words is "three hundred eighty-one million, three hundred ninety-eight thousand, three hundred eighty".