1220661842 has 8 divisors (see below), whose sum is σ = 1910601216. Its totient is φ = 583794772.

The previous prime is 1220661839. The next prime is 1220661847. The reversal of 1220661842 is 2481660221.

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

It is a junction number, because it is equal to n+sod(n) for n = 1220661799 and 1220661808.

It is not an unprimeable number, because it can be changed into a prime (1220661847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13268018 + ... + 13268109.

It is an arithmetic number, because the mean of its divisors is an integer number (238825152).

Almost surely, 2^1220661842 is an apocalyptic number.

1220661842 is a deficient number, since it is larger than the sum of its proper divisors (689939374).

1220661842 is a wasteful number, since it uses less digits than its factorization.

1220661842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26536152.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1220661842 is about 34937.9713492355. The cubic root of 1220661842 is about 1068.7229186759.

The spelling of 1220661842 in words is "one billion, two hundred twenty million, six hundred sixty-one thousand, eight hundred forty-two".