1263540 has 24 divisors (see below), whose sum is σ = 3538080. Its totient is φ = 336928.

The previous prime is 1263539. The next prime is 1263541. The reversal of 1263540 is 453621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1263539) and next prime (1263541).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10470 + ... + 10589.

It is an arithmetic number, because the mean of its divisors is an integer number (147420).

2^1263540 is an apocalyptic number.

1263540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263540 is an abundant number, since it is smaller than the sum of its proper divisors (2274540).

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

1263540 is a wasteful number, since it uses less digits than its factorization.

1263540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21071 (or 21069 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1263540 is about 1124.0729513693. The cubic root of 1263540 is about 108.1092858092.

It can be divided in two parts, 126 and 3540, that multiplied together give a triangular number (446040 = T₉₄₄).

The spelling of 1263540 in words is "one million, two hundred sixty-three thousand, five hundred forty".