1242040129 has 4 divisors (see below), whose sum is σ = 1354952880. Its totient is φ = 1129127380.

The previous prime is 1242040109. The next prime is 1242040139. The reversal of 1242040129 is 9210402421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242040129 - 2¹³ = 1242031937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242040109) 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, 56456359 + ... + 56456380.

It is an arithmetic number, because the mean of its divisors is an integer number (338738220).

Almost surely, 2^1242040129 is an apocalyptic number.

It is an amenable number.

1242040129 is a deficient number, since it is larger than the sum of its proper divisors (112912751).

1242040129 is a wasteful number, since it uses less digits than its factorization.

1242040129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112912750.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1242040129 is about 35242.5897033688. The cubic root of 1242040129 is about 1074.9259380020.

The spelling of 1242040129 in words is "one billion, two hundred forty-two million, forty thousand, one hundred twenty-nine".