1263988 has 24 divisors (see below), whose sum is σ = 2520000. Its totient is φ = 549120.

The previous prime is 1263979. The next prime is 1264009. The reversal of 1263988 is 8893621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (105000).

2^1263988 is an apocalyptic number.

It is an amenable number.

1263988 is a deficient number, since it is larger than the sum of its proper divisors (1256012).

1263988 is a wasteful number, since it uses less digits than its factorization.

1263988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287 (or 1285 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 1263988 is about 1124.2722090312. The cubic root of 1263988 is about 108.1220613544.

It can be divided in two parts, 126 and 3988, that added together give a palindrome (4114).

The spelling of 1263988 in words is "one million, two hundred sixty-three thousand, nine hundred eighty-eight".