1224391740 has 144 divisors (see below), whose sum is σ = 4058474784. Its totient is φ = 273968640.

The previous prime is 1224391739. The next prime is 1224391747. The reversal of 1224391740 is 471934221.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224391747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87894 + ... + 100866.

Almost surely, 2^1224391740 is an apocalyptic number.

1224391740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1224391740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2029237392).

1224391740 is an abundant number, since it is smaller than the sum of its proper divisors (2834083044).

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

1224391740 is a wasteful number, since it uses less digits than its factorization.

1224391740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020 (or 13007 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1224391740 is about 34991.3094925011. The cubic root of 1224391740 is about 1069.8103544874.

The spelling of 1224391740 in words is "one billion, two hundred twenty-four million, three hundred ninety-one thousand, seven hundred forty".