1242152389 has 4 divisors (see below), whose sum is σ = 1284985260. Its totient is φ = 1199319520.

The previous prime is 1242152383. The next prime is 1242152449. The reversal of 1242152389 is 9832512421.

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 221861025 + 1020291364 = 14895^2 + 31942^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242152389 - 2³ = 1242152381 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 (1242152381) 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, 21416392 + ... + 21416449.

It is an arithmetic number, because the mean of its divisors is an integer number (321246315).

Almost surely, 2^1242152389 is an apocalyptic number.

It is an amenable number.

1242152389 is a deficient number, since it is larger than the sum of its proper divisors (42832871).

1242152389 is an equidigital number, since it uses as much as digits as its factorization.

1242152389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42832870.

The product of its digits is 34560, while the sum is 37.

The square root of 1242152389 is about 35244.1823426222. The cubic root of 1242152389 is about 1074.9583222349.

The spelling of 1242152389 in words is "one billion, two hundred forty-two million, one hundred fifty-two thousand, three hundred eighty-nine".