1223142780 has 96 divisors (see below), whose sum is σ = 3511065600. Its totient is φ = 318060288.

The previous prime is 1223142769. The next prime is 1223142793. The reversal of 1223142780 is 872413221.

It is a super-2 number, since 2×1223142780² = 2992156520532256800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 391866 + ... + 394974.

It is an arithmetic number, because the mean of its divisors is an integer number (36573600).

Almost surely, 2^1223142780 is an apocalyptic number.

1223142780 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 1223142780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1755532800).

1223142780 is an abundant number, since it is smaller than the sum of its proper divisors (2287922820).

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

1223142780 is a wasteful number, since it uses less digits than its factorization.

1223142780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283 (or 3281 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 1223142780 is about 34973.4582219145. The cubic root of 1223142780 is about 1069.4464717869.

The spelling of 1223142780 in words is "one billion, two hundred twenty-three million, one hundred forty-two thousand, seven hundred eighty".