1220023123440 has 160 divisors (see below), whose sum is σ = 4152177386496. Its totient is φ = 293879239680.

The previous prime is 1220023123393. The next prime is 1220023123477. The reversal of 1220023123440 is 443213200221.

It is a happy number.

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 1220023123440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1057272 + ... + 1886231.

Almost surely, 2^{1220023123440} is an apocalyptic number.

1220023123440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220023123440 is an abundant number, since it is smaller than the sum of its proper divisors (2932154263056).

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

1220023123440 is a wasteful number, since it uses less digits than its factorization.

1220023123440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943687 (or 2943681 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 1220023123440 its reverse (443213200221), we get a palindrome (1663236323661).

The spelling of 1220023123440 in words is "one trillion, two hundred twenty billion, twenty-three million, one hundred twenty-three thousand, four hundred forty".