1263998 has 8 divisors (see below), whose sum is σ = 1900920. Its totient is φ = 630360.

The previous prime is 1263979. The next prime is 1264009. The reversal of 1263998 is 8993621.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728 + ... + 1748.

It is an arithmetic number, because the mean of its divisors is an integer number (237615).

2^1263998 is an apocalyptic number.

1263998 is a deficient number, since it is larger than the sum of its proper divisors (636922).

1263998 is a wasteful number, since it uses less digits than its factorization.

1263998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642.

The product of its digits is 23328, while the sum is 38.

The square root of 1263998 is about 1124.2766563440. The cubic root of 1263998 is about 108.1223464884.

The spelling of 1263998 in words is "one million, two hundred sixty-three thousand, nine hundred ninety-eight".