1242653623 has 4 divisors (see below), whose sum is σ = 1261200760. Its totient is φ = 1224106488.

The previous prime is 1242653617. The next prime is 1242653627. The reversal of 1242653623 is 3263562421.

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-1242653623 is a prime.

It is a super-2 number, since 2×1242653623² = 3088376053510052258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242653627) 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, 9273468 + ... + 9273601.

It is an arithmetic number, because the mean of its divisors is an integer number (315300190).

Almost surely, 2^1242653623 is an apocalyptic number.

1242653623 is a deficient number, since it is larger than the sum of its proper divisors (18547137).

1242653623 is an equidigital number, since it uses as much as digits as its factorization.

1242653623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18547136.

The product of its digits is 51840, while the sum is 34.

The square root of 1242653623 is about 35251.2925011268. The cubic root of 1242653623 is about 1075.1028920444.

It can be divided in two parts, 12426 and 53623, that added together give a square (66049 = 257²).

The spelling of 1242653623 in words is "one billion, two hundred forty-two million, six hundred fifty-three thousand, six hundred twenty-three".