1220403 has 12 divisors (see below), whose sum is σ = 1703240. Its totient is φ = 777216.

The previous prime is 1220393. The next prime is 1220411. The reversal of 1220403 is 3040221.

It is not a de Polignac number, because 1220403 - 2⁸ = 1220147 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1203 + ... + 1971.

2^1220403 is an apocalyptic number.

1220403 is a deficient number, since it is larger than the sum of its proper divisors (482837).

1220403 is an equidigital number, since it uses as much as digits as its factorization.

1220403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 1220403 is about 1104.7185161841. The cubic root of 1220403 is about 106.8647372246.

Adding to 1220403 its reverse (3040221), we get a palindrome (4260624).

The spelling of 1220403 in words is "one million, two hundred twenty thousand, four hundred three".