1242171403 has 4 divisors (see below), whose sum is σ = 1355096088. Its totient is φ = 1129246720.

The previous prime is 1242171397. The next prime is 1242171439. The reversal of 1242171403 is 3041712421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242171403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242171473) 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, 56462326 + ... + 56462347.

It is an arithmetic number, because the mean of its divisors is an integer number (338774022).

Almost surely, 2^1242171403 is an apocalyptic number.

1242171403 is a deficient number, since it is larger than the sum of its proper divisors (112924685).

1242171403 is a wasteful number, since it uses less digits than its factorization.

1242171403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112924684.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1242171403 is about 35244.4520882365. The cubic root of 1242171403 is about 1074.9638071103.

Adding to 1242171403 its reverse (3041712421), we get a palindrome (4283883824).

The spelling of 1242171403 in words is "one billion, two hundred forty-two million, one hundred seventy-one thousand, four hundred three".