1243000440 has 96 divisors (see below), whose sum is σ = 4407015600. Its totient is φ = 301332480.

The previous prime is 1243000427. The next prime is 1243000469. The reversal of 1243000440 is 440003421.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152985 + ... + 160904.

Almost surely, 2^1243000440 is an apocalyptic number.

1243000440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243000440 is an abundant number, since it is smaller than the sum of its proper divisors (3164015160).

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

1243000440 is a wasteful number, since it uses less digits than its factorization.

1243000440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313917 (or 313910 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1243000440 is about 35256.2113676441. The cubic root of 1243000440 is about 1075.2029009475.

Adding to 1243000440 its reverse (440003421), we get a palindrome (1683003861).

The spelling of 1243000440 in words is "one billion, two hundred forty-three million, four hundred forty", and thus it is an aban number.