1221790446 has 16 divisors (see below), whose sum is σ = 2715090000. Its totient is φ = 407263464.

The previous prime is 1221790439. The next prime is 1221790457. The reversal of 1221790446 is 6440971221.

It is a happy number.

1221790446 is a `hidden beast` number, since 122 + 1 + 7 + 90 + 446 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1221790446.

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, 11312821 + ... + 11312928.

It is an arithmetic number, because the mean of its divisors is an integer number (169693125).

Almost surely, 2^1221790446 is an apocalyptic number.

1221790446 is an abundant number, since it is smaller than the sum of its proper divisors (1493299554).

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

1221790446 is a wasteful number, since it uses less digits than its factorization.

1221790446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22625760 (or 22625754 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1221790446 is about 34954.1191564027. The cubic root of 1221790446 is about 1069.0521918010.

The spelling of 1221790446 in words is "one billion, two hundred twenty-one million, seven hundred ninety thousand, four hundred forty-six".