1220656403 has 4 divisors (see below), whose sum is σ = 1260032448. Its totient is φ = 1181280360.

The previous prime is 1220656379. The next prime is 1220656427. The reversal of 1220656403 is 3046560221.

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

It is an interprime number because it is at equal distance from previous prime (1220656379) and next prime (1220656427).

It is a cyclic number.

It is not a de Polignac number, because 1220656403 - 2¹⁴ = 1220640019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220656453) 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, 19687976 + ... + 19688037.

It is an arithmetic number, because the mean of its divisors is an integer number (315008112).

Almost surely, 2^1220656403 is an apocalyptic number.

1220656403 is a deficient number, since it is larger than the sum of its proper divisors (39376045).

1220656403 is an equidigital number, since it uses as much as digits as its factorization.

1220656403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39376044.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1220656403 is about 34937.8935112007. The cubic root of 1220656403 is about 1068.7213313423.

The spelling of 1220656403 in words is "one billion, two hundred twenty million, six hundred fifty-six thousand, four hundred three".