1242389738 has 8 divisors (see below), whose sum is σ = 1863734400. Its totient is φ = 621144940.

The previous prime is 1242389723. The next prime is 1242389747. The reversal of 1242389738 is 8379832421.

It is a happy number.

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

It is a super-2 number, since 2×1242389738² = 3087064522175417288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1242389692 and 1242389701.

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, 33863 + ... + 60261.

It is an arithmetic number, because the mean of its divisors is an integer number (232966800).

Almost surely, 2^1242389738 is an apocalyptic number.

1242389738 is a deficient number, since it is larger than the sum of its proper divisors (621344662).

1242389738 is a wasteful number, since it uses less digits than its factorization.

1242389738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49932.

The product of its digits is 580608, while the sum is 47.

The square root of 1242389738 is about 35247.5493899931. The cubic root of 1242389738 is about 1075.0267851267.

The spelling of 1242389738 in words is "one billion, two hundred forty-two million, three hundred eighty-nine thousand, seven hundred thirty-eight".