1242728894 has 32 divisors (see below), whose sum is σ = 2067793920. Its totient is φ = 555438400.

The previous prime is 1242728891. The next prime is 1242728941. The reversal of 1242728894 is 4988272421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242728891) 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, 372317 + ... + 375639.

It is an arithmetic number, because the mean of its divisors is an integer number (64618560).

Almost surely, 2^1242728894 is an apocalyptic number.

1242728894 is a deficient number, since it is larger than the sum of its proper divisors (825065026).

1242728894 is a wasteful number, since it uses less digits than its factorization.

1242728894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616.

The product of its digits is 516096, while the sum is 47.

The square root of 1242728894 is about 35252.3601195721. The cubic root of 1242728894 is about 1075.1245989343.

The spelling of 1242728894 in words is "one billion, two hundred forty-two million, seven hundred twenty-eight thousand, eight hundred ninety-four".