1242395691 has 16 divisors (see below), whose sum is σ = 1679756064. Its totient is φ = 816712704.

The previous prime is 1242395681. The next prime is 1242395719. The reversal of 1242395691 is 1965932421.

It is not a de Polignac number, because 1242395691 - 2⁹ = 1242395179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242395611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72901 + ... + 88313.

It is an arithmetic number, because the mean of its divisors is an integer number (104984754).

Almost surely, 2^1242395691 is an apocalyptic number.

1242395691 is a deficient number, since it is larger than the sum of its proper divisors (437360373).

1242395691 is a wasteful number, since it uses less digits than its factorization.

1242395691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15790.

The product of its digits is 116640, while the sum is 42.

The square root of 1242395691 is about 35247.6338354789. The cubic root of 1242395691 is about 1075.0285021468.

The spelling of 1242395691 in words is "one billion, two hundred forty-two million, three hundred ninety-five thousand, six hundred ninety-one".