1221793678 has 16 divisors (see below), whose sum is σ = 2095572960. Its totient is φ = 523358496.

The previous prime is 1221793673. The next prime is 1221793711. The reversal of 1221793678 is 8763971221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221793673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7488 + ... + 49996.

It is an arithmetic number, because the mean of its divisors is an integer number (130973310).

Almost surely, 2^1221793678 is an apocalyptic number.

1221793678 is a deficient number, since it is larger than the sum of its proper divisors (873779282).

1221793678 is a wasteful number, since it uses less digits than its factorization.

1221793678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44571.

The product of its digits is 254016, while the sum is 46.

The square root of 1221793678 is about 34954.1653884054. The cubic root of 1221793678 is about 1069.0531344541.

The spelling of 1221793678 in words is "one billion, two hundred twenty-one million, seven hundred ninety-three thousand, six hundred seventy-eight".