1220432985 has 24 divisors (see below), whose sum is σ = 2226756480. Its totient is φ = 616639392.

The previous prime is 1220432981. The next prime is 1220432989. The reversal of 1220432985 is 5892340221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1220432981) and next prime (1220432989).

It is not a de Polignac number, because 1220432985 - 2² = 1220432981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220432981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 712849 + ... + 714558.

It is an arithmetic number, because the mean of its divisors is an integer number (92781520).

Almost surely, 2^1220432985 is an apocalyptic number.

1220432985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220432985 is a deficient number, since it is larger than the sum of its proper divisors (1006323495).

1220432985 is a wasteful number, since it uses less digits than its factorization.

1220432985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427437 (or 1427434 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1220432985 is about 34934.6960055473. The cubic root of 1220432985 is about 1068.6561243081.

The spelling of 1220432985 in words is "one billion, two hundred twenty million, four hundred thirty-two thousand, nine hundred eighty-five".