1224003440 has 40 divisors (see below), whose sum is σ = 3104520048. Its totient is φ = 445091840.

The previous prime is 1224003343. The next prime is 1224003499. The reversal of 1224003440 is 443004221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1224003440² = 2996368842263667200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 694577 + ... + 696336.

Almost surely, 2^1224003440 is an apocalyptic number.

1224003440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1224003440 is an abundant number, since it is smaller than the sum of its proper divisors (1880516608).

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

1224003440 is a wasteful number, since it uses less digits than its factorization.

1224003440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390937 (or 1390931 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1224003440 is about 34985.7605319650. The cubic root of 1224003440 is about 1069.6972503589.

Adding to 1224003440 its reverse (443004221), we get a palindrome (1667007661).

The spelling of 1224003440 in words is "one billion, two hundred twenty-four million, three thousand, four hundred forty".