1242890247 has 16 divisors (see below), whose sum is σ = 1755509760. Its totient is φ = 779478912.

The previous prime is 1242890239. The next prime is 1242890249. The reversal of 1242890247 is 7420982421.

It is a happy number.

It is not a de Polignac number, because 1242890247 - 2³ = 1242890239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242890249) 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, 134188 + ... + 143150.

It is an arithmetic number, because the mean of its divisors is an integer number (109719360).

Almost surely, 2^1242890247 is an apocalyptic number.

1242890247 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1242890247 is a deficient number, since it is larger than the sum of its proper divisors (512619513).

1242890247 is a wasteful number, since it uses less digits than its factorization.

1242890247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11702.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1242890247 is about 35254.6485871012. The cubic root of 1242890247 is about 1075.1711274713.

The spelling of 1242890247 in words is "one billion, two hundred forty-two million, eight hundred ninety thousand, two hundred forty-seven".