1242689412 has 24 divisors (see below), whose sum is σ = 2922443776. Its totient is φ = 410967648.

The previous prime is 1242689387. The next prime is 1242689479. The reversal of 1242689412 is 2149862421.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406183 + ... + 409230.

Almost surely, 2^1242689412 is an apocalyptic number.

1242689412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1242689412 is an abundant number, since it is smaller than the sum of its proper divisors (1679754364).

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

1242689412 is a wasteful number, since it uses less digits than its factorization.

1242689412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815547 (or 815545 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 1242689412 is about 35251.8001242490. The cubic root of 1242689412 is about 1075.1132130991.

The spelling of 1242689412 in words is "one billion, two hundred forty-two million, six hundred eighty-nine thousand, four hundred twelve".