1221679470 has 32 divisors (see below), whose sum is σ = 3198579840. Its totient is φ = 296164640.

The previous prime is 1221679451. The next prime is 1221679471. The reversal of 1221679470 is 749761221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221679471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1850700 + ... + 1851359.

It is an arithmetic number, because the mean of its divisors is an integer number (99955620).

Almost surely, 2^1221679470 is an apocalyptic number.

1221679470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221679470 is an abundant number, since it is smaller than the sum of its proper divisors (1976900370).

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

1221679470 is a wasteful number, since it uses less digits than its factorization.

1221679470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3702080.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 1221679470 is about 34952.5316679636. The cubic root of 1221679470 is about 1069.0198232584.

The spelling of 1221679470 in words is "one billion, two hundred twenty-one million, six hundred seventy-nine thousand, four hundred seventy".