381604 has 6 divisors (see below), whose sum is σ = 667814. Its totient is φ = 190800.

The previous prime is 381569. The next prime is 381607. The reversal of 381604 is 406183.

It can be written as a sum of positive squares in only one way, i.e., 252004 + 129600 = 502^2 + 360^2 .

It is a super-2 number, since 2×381604² = 291243225632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47697 + ... + 47704.

2³⁸¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

381604 is a deficient number, since it is larger than the sum of its proper divisors (286210).

381604 is a wasteful number, since it uses less digits than its factorization.

381604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95405 (or 95403 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 381604 is about 617.7410460703. The cubic root of 381604 is about 72.5333338590.

Adding to 381604 its reverse (406183), we get a palindrome (787787).

The spelling of 381604 in words is "three hundred eighty-one thousand, six hundred four".