1223015640 has 128 divisors (see below), whose sum is σ = 4574430720. Its totient is φ = 254131200.

The previous prime is 1223015603. The next prime is 1223015641. The reversal of 1223015640 is 465103221.

1223015640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1223015640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223015641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56941 + ... + 75420.

It is an arithmetic number, because the mean of its divisors is an integer number (35737740).

Almost surely, 2^1223015640 is an apocalyptic number.

1223015640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223015640 is an abundant number, since it is smaller than the sum of its proper divisors (3351415080).

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

1223015640 is a wasteful number, since it uses less digits than its factorization.

1223015640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132393 (or 132389 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1223015640 is about 34971.6405105623. The cubic root of 1223015640 is about 1069.4094158416.

Adding to 1223015640 its reverse (465103221), we get a palindrome (1688118861).

The spelling of 1223015640 in words is "one billion, two hundred twenty-three million, fifteen thousand, six hundred forty".