1263044440 has 32 divisors (see below), whose sum is σ = 3247829280. Its totient is φ = 433043712.

The previous prime is 1263044429. The next prime is 1263044473. The reversal of 1263044440 is 444403621.

It is a super-3 number, since 3×1263044440³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1263044399 and 1263044408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2255157 + ... + 2255716.

It is an arithmetic number, because the mean of its divisors is an integer number (101494665).

Almost surely, 2^1263044440 is an apocalyptic number.

1263044440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263044440 is an abundant number, since it is smaller than the sum of its proper divisors (1984784840).

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

1263044440 is a wasteful number, since it uses less digits than its factorization.

1263044440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510891 (or 4510887 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 1263044440 is about 35539.3365160353. The cubic root of 1263044440 is about 1080.9515048489.

The spelling of 1263044440 in words is "one billion, two hundred sixty-three million, forty-four thousand, four hundred forty".