1242642623 has 4 divisors (see below), whose sum is σ = 1248069240. Its totient is φ = 1237216008.

The previous prime is 1242642613. The next prime is 1242642629. The reversal of 1242642623 is 3262462421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3262462421 = 107 ⋅30490303.

It is a cyclic number.

It is not a de Polignac number, because 1242642623 - 2⁶ = 1242642559 is a prime.

It is a super-4 number, since 4×1242642623⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242642623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242642629) 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, 2712965 + ... + 2713422.

It is an arithmetic number, because the mean of its divisors is an integer number (312017310).

Almost surely, 2^1242642623 is an apocalyptic number.

1242642623 is a deficient number, since it is larger than the sum of its proper divisors (5426617).

1242642623 is an equidigital number, since it uses as much as digits as its factorization.

1242642623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5426616.

The product of its digits is 27648, while the sum is 32.

The square root of 1242642623 is about 35251.1364781336. The cubic root of 1242642623 is about 1075.0997197561.

The spelling of 1242642623 in words is "one billion, two hundred forty-two million, six hundred forty-two thousand, six hundred twenty-three".