1242123994 has 8 divisors (see below), whose sum is σ = 1882394388. Its totient is φ = 614659200.

The previous prime is 1242123979. The next prime is 1242124007. The reversal of 1242123994 is 4993212421.

It can be written as a sum of positive squares in 2 ways, for example, as 1093161969 + 148962025 = 33063^2 + 12205^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3201157 + ... + 3201544.

Almost surely, 2^1242123994 is an apocalyptic number.

1242123994 is a deficient number, since it is larger than the sum of its proper divisors (640270394).

1242123994 is an equidigital number, since it uses as much as digits as its factorization.

1242123994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6402800.

The product of its digits is 31104, while the sum is 37.

The square root of 1242123994 is about 35243.7795078791. The cubic root of 1242123994 is about 1074.9501311642.

The spelling of 1242123994 in words is "one billion, two hundred forty-two million, one hundred twenty-three thousand, nine hundred ninety-four".