1242906853 has 4 divisors (see below), whose sum is σ = 1285765740. Its totient is φ = 1200047968.

The previous prime is 1242906829. The next prime is 1242906859. The reversal of 1242906853 is 3586092421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 607967649 + 634939204 = 24657^2 + 25198^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242906853 - 2²¹ = 1240809701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242906859) 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, 21429400 + ... + 21429457.

It is an arithmetic number, because the mean of its divisors is an integer number (321441435).

Almost surely, 2^1242906853 is an apocalyptic number.

It is an amenable number.

1242906853 is a deficient number, since it is larger than the sum of its proper divisors (42858887).

1242906853 is an equidigital number, since it uses as much as digits as its factorization.

1242906853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42858886.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1242906853 is about 35254.8841013554. The cubic root of 1242906853 is about 1075.1759158298.

The spelling of 1242906853 in words is "one billion, two hundred forty-two million, nine hundred six thousand, eight hundred fifty-three".