381369660 has 96 divisors (see below), whose sum is σ = 1223040000. Its totient is φ = 86980608.

The previous prime is 381369643. The next prime is 381369661. The reversal of 381369660 is 66963183.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381369661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 304716 + ... + 305964.

It is an arithmetic number, because the mean of its divisors is an integer number (12740000).

Almost surely, 2^381369660 is an apocalyptic number.

381369660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381369660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611520000).

381369660 is an abundant number, since it is smaller than the sum of its proper divisors (841670340).

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

381369660 is a wasteful number, since it uses less digits than its factorization.

381369660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995 (or 1993 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 381369660 is about 19528.6881279824. The cubic root of 381369660 is about 725.1848343639.

The spelling of 381369660 in words is "three hundred eighty-one million, three hundred sixty-nine thousand, six hundred sixty".