1263820 has 24 divisors (see below), whose sum is σ = 2746800. Its totient is φ = 487872.

The previous prime is 1263817. The next prime is 1263853. The reversal of 1263820 is 283621.

It is a super-3 number, since 3×1263820³ = 6055875333044904000, which contains 333 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1263791 and 1263800.

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, 510 + ... + 1669.

It is an arithmetic number, because the mean of its divisors is an integer number (114450).

2^1263820 is an apocalyptic number.

1263820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263820 is an abundant number, since it is smaller than the sum of its proper divisors (1482980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1263820 is a wasteful number, since it uses less digits than its factorization.

1263820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217 (or 2215 counting only the distinct ones).

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

The square root of 1263820 is about 1124.1974915467. The cubic root of 1263820 is about 108.1172708788.

The spelling of 1263820 in words is "one million, two hundred sixty-three thousand, eight hundred twenty".