1240691290 has 8 divisors (see below), whose sum is σ = 2233244340. Its totient is φ = 496276512.

The previous prime is 1240691281. The next prime is 1240691293. The reversal of 1240691290 is 921960421.

It can be written as a sum of positive squares in 2 ways, for example, as 1227170961 + 13520329 = 35031^2 + 3677^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1240691293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62034555 + ... + 62034574.

Almost surely, 2^1240691290 is an apocalyptic number.

1240691290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1240691290 is a deficient number, since it is larger than the sum of its proper divisors (992553050).

1240691290 is a wasteful number, since it uses less digits than its factorization.

1240691290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124069136.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1240691290 is about 35223.4480140715. The cubic root of 1240691290 is about 1074.5366786514.

The spelling of 1240691290 in words is "one billion, two hundred forty million, six hundred ninety-one thousand, two hundred ninety".