630986 has 4 divisors (see below), whose sum is σ = 946482. Its totient is φ = 315492.

The previous prime is 630967. The next prime is 630997. The reversal of 630986 is 689036.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 609961 + 21025 = 781^2 + 145^2 .

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157745 + ... + 157748.

2⁶³⁰⁹⁸⁶ is an apocalyptic number.

630986 is a deficient number, since it is larger than the sum of its proper divisors (315496).

630986 is a wasteful number, since it uses less digits than its factorization.

630986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315495.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 630986 is about 794.3462721005. The cubic root of 630986 is about 85.7708882749.

The spelling of 630986 in words is "six hundred thirty thousand, nine hundred eighty-six".