381553 has 8 divisors (see below), whose sum is σ = 403200. Its totient is φ = 360528.

The previous prime is 381541. The next prime is 381559. The reversal of 381553 is 355183.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381553 - 2¹³ = 373361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1600 + ... + 1822.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

2³⁸¹⁵⁵³ is an apocalyptic number.

It is an amenable number.

381553 is a deficient number, since it is larger than the sum of its proper divisors (21647).

381553 is a wasteful number, since it uses less digits than its factorization.

381553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its digits is 1800, while the sum is 25.

The square root of 381553 is about 617.6997652582. The cubic root of 381553 is about 72.5301024421.

The spelling of 381553 in words is "three hundred eighty-one thousand, five hundred fifty-three".