1222656420 has 48 divisors (see below), whose sum is σ = 3431877120. Its totient is φ = 325238016.

The previous prime is 1222656397. The next prime is 1222656431. The reversal of 1222656420 is 246562221.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372 + ... + 49451.

It is an arithmetic number, because the mean of its divisors is an integer number (71497440).

Almost surely, 2^1222656420 is an apocalyptic number.

1222656420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222656420 is an abundant number, since it is smaller than the sum of its proper divisors (2209220700).

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

1222656420 is a wasteful number, since it uses less digits than its factorization.

1222656420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50244 (or 50242 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1222656420 is about 34966.5042576463. The cubic root of 1222656420 is about 1069.3047044886.

The spelling of 1222656420 in words is "one billion, two hundred twenty-two million, six hundred fifty-six thousand, four hundred twenty".