1220456587 has 8 divisors (see below), whose sum is σ = 1397478656. Its totient is φ = 1044102312.

The previous prime is 1220456569. The next prime is 1220456593. The reversal of 1220456587 is 7856540221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220456587 - 2⁷ = 1220456459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220456597) 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, 163023 + ... + 170344.

It is an arithmetic number, because the mean of its divisors is an integer number (174684832).

Almost surely, 2^1220456587 is an apocalyptic number.

1220456587 is a deficient number, since it is larger than the sum of its proper divisors (177022069).

1220456587 is an equidigital number, since it uses as much as digits as its factorization.

1220456587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333897.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 1220456587 is about 34935.0338056227. The cubic root of 1220456587 is about 1068.6630131909.

The spelling of 1220456587 in words is "one billion, two hundred twenty million, four hundred fifty-six thousand, five hundred eighty-seven".