1221678007 has 8 divisors (see below), whose sum is σ = 1333013760. Its totient is φ = 1110387960.

The previous prime is 1221677999. The next prime is 1221678011. The reversal of 1221678007 is 7008761221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221678007 - 2³ = 1221677999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221678407) 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, 69298 + ... + 85120.

It is an arithmetic number, because the mean of its divisors is an integer number (166626720).

Almost surely, 2^1221678007 is an apocalyptic number.

1221678007 is a deficient number, since it is larger than the sum of its proper divisors (111335753).

1221678007 is a wasteful number, since it uses less digits than its factorization.

1221678007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22853.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 1221678007 is about 34952.5107395735. The cubic root of 1221678007 is about 1069.0193965298.

The spelling of 1221678007 in words is "one billion, two hundred twenty-one million, six hundred seventy-eight thousand, seven".