1242647892 has 60 divisors (see below), whose sum is σ = 3277371636. Its totient is φ = 410538240.

The previous prime is 1242647843. The next prime is 1242647947. The reversal of 1242647892 is 2987462421.

It can be written as a sum of positive squares in 2 ways, for example, as 241305156 + 1001342736 = 15534^2 + 31644^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19642 + ... + 53582.

Almost surely, 2^1242647892 is an apocalyptic number.

1242647892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242647892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1638685818).

1242647892 is an abundant number, since it is smaller than the sum of its proper divisors (2034723744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242647892 is a wasteful number, since it uses less digits than its factorization.

1242647892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34070 (or 34059 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 1242647892 is about 35251.2112132335. The cubic root of 1242647892 is about 1075.1012392846.

The spelling of 1242647892 in words is "one billion, two hundred forty-two million, six hundred forty-seven thousand, eight hundred ninety-two".