1220358487 has 4 divisors (see below), whose sum is σ = 1221113880. Its totient is φ = 1219603096.

The previous prime is 1220358479. The next prime is 1220358499. The reversal of 1220358487 is 7848530221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220358487 - 2³ = 1220358479 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 (1220358427) 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, 375268 + ... + 378505.

It is an arithmetic number, because the mean of its divisors is an integer number (305278470).

Almost surely, 2^1220358487 is an apocalyptic number.

1220358487 is a deficient number, since it is larger than the sum of its proper divisors (755393).

1220358487 is an equidigital number, since it uses as much as digits as its factorization.

1220358487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755392.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 1220358487 is about 34933.6297426992. The cubic root of 1220358487 is about 1068.6343794670.

The spelling of 1220358487 in words is "one billion, two hundred twenty million, three hundred fifty-eight thousand, four hundred eighty-seven".