1242917290 has 8 divisors (see below), whose sum is σ = 2237251140. Its totient is φ = 497166912.

The previous prime is 1242917261. The next prime is 1242917353. The reversal of 1242917290 is 927192421.

It can be written as a sum of positive squares in 2 ways, for example, as 1242069049 + 848241 = 35243^2 + 921^2 .

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

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, 62145855 + ... + 62145874.

Almost surely, 2^1242917290 is an apocalyptic number.

1242917290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1242917290 is a deficient number, since it is larger than the sum of its proper divisors (994333850).

1242917290 is a wasteful number, since it uses less digits than its factorization.

1242917290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124291736.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1242917290 is about 35255.0321230885. The cubic root of 1242917290 is about 1075.1789253285.

The spelling of 1242917290 in words is "one billion, two hundred forty-two million, nine hundred seventeen thousand, two hundred ninety".