1224020340 has 36 divisors (see below), whose sum is σ = 3712862244. Its totient is φ = 326405376.

The previous prime is 1224020323. The next prime is 1224020351. The reversal of 1224020340 is 430204221.

It can be written as a sum of positive squares in 2 ways, for example, as 440244324 + 783776016 = 20982^2 + 27996^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 3399877 + ... + 3400236.

Almost surely, 2^1224020340 is an apocalyptic number.

1224020340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1224020340 is an abundant number, since it is smaller than the sum of its proper divisors (2488841904).

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

1224020340 is a wasteful number, since it uses less digits than its factorization.

1224020340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800128 (or 6800123 counting only the distinct ones).

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

The square root of 1224020340 is about 34986.0020579660. The cubic root of 1224020340 is about 1069.7021734933.

Adding to 1224020340 its reverse (430204221), we get a palindrome (1654224561).

The spelling of 1224020340 in words is "one billion, two hundred twenty-four million, twenty thousand, three hundred forty".