381090 has 16 divisors (see below), whose sum is σ = 914688. Its totient is φ = 101616.

The previous prime is 381077. The next prime is 381097. The reversal of 381090 is 90183.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (381097) by changing a digit.

381090 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6322 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (57168).

2³⁸¹⁰⁹⁰ is an apocalyptic number.

381090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

381090 is an abundant number, since it is smaller than the sum of its proper divisors (533598).

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

381090 is a wasteful number, since it uses less digits than its factorization.

381090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12713.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 381090 is about 617.3248739521. The cubic root of 381090 is about 72.5007530639.

It can be divided in two parts, 38 and 1090, that added together give a triangular number (1128 = T₄₇).

The spelling of 381090 in words is "three hundred eighty-one thousand, ninety".