1242209984 has 14 divisors (see below), whose sum is σ = 2465010564. Its totient is φ = 621104960.

The previous prime is 1242209981. The next prime is 1242209993. The reversal of 1242209984 is 4899022421.

It is not an unprimeable number, because it can be changed into a prime (1242209981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9704702 + ... + 9704829.

Almost surely, 2^1242209984 is an apocalyptic number.

It is an amenable number.

1242209984 is a deficient number, since it is larger than the sum of its proper divisors (1222800580).

1242209984 is an equidigital number, since it uses as much as digits as its factorization.

1242209984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19409543 (or 19409533 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 1242209984 is about 35244.9994183572. Note that the first 3 decimals coincide. The cubic root of 1242209984 is about 1074.9749362103.

Adding to 1242209984 its sum of digits (41), we get a square (1242210025 = 35245²).

The spelling of 1242209984 in words is "one billion, two hundred forty-two million, two hundred nine thousand, nine hundred eighty-four".