1228823920 has 40 divisors (see below), whose sum is σ = 3025078704. Its totient is φ = 462615552.

The previous prime is 1228823891. The next prime is 1228824001. The reversal of 1228823920 is 293288221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1228823920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450414 + ... + 453133.

Almost surely, 2^1228823920 is an apocalyptic number.

1228823920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1228823920 is an abundant number, since it is smaller than the sum of its proper divisors (1796254784).

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

1228823920 is a wasteful number, since it uses less digits than its factorization.

1228823920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903577 (or 903571 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1228823920 is about 35054.5848641800. The cubic root of 1228823920 is about 1071.0996701021.

The spelling of 1228823920 in words is "one billion, two hundred twenty-eight million, eight hundred twenty-three thousand, nine hundred twenty".