630381 has 4 divisors (see below), whose sum is σ = 840512. Its totient is φ = 420252.

The previous prime is 630353. The next prime is 630391. The reversal of 630381 is 183036.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 630381 - 2⁵ = 630349 is a prime.

It is a super-2 number, since 2×630381² = 794760410322, which contains 22 as substring.

It is a D-number.

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

It is a Duffinian number.

630381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105061 + ... + 105066.

It is an arithmetic number, because the mean of its divisors is an integer number (210128).

2⁶³⁰³⁸¹ is an apocalyptic number.

It is an amenable number.

630381 is a deficient number, since it is larger than the sum of its proper divisors (210131).

630381 is a wasteful number, since it uses less digits than its factorization.

630381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210130.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 630381 is about 793.9653644839. The cubic root of 630381 is about 85.7434666517.

The spelling of 630381 in words is "six hundred thirty thousand, three hundred eighty-one".