1240396385 has 8 divisors (see below), whose sum is σ = 1499184960. Its totient is φ = 985177584.

The previous prime is 1240396379. The next prime is 1240396429. The reversal of 1240396385 is 5836930421.

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

It is a cyclic number.

It is not a de Polignac number, because 1240396385 - 2⁶ = 1240396321 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 891677 + ... + 893066.

It is an arithmetic number, because the mean of its divisors is an integer number (187398120).

Almost surely, 2^1240396385 is an apocalyptic number.

It is an amenable number.

1240396385 is a deficient number, since it is larger than the sum of its proper divisors (258788575).

1240396385 is a wasteful number, since it uses less digits than its factorization.

1240396385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784887.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 1240396385 is about 35219.2615623894. The cubic root of 1240396385 is about 1074.4515348952.

The spelling of 1240396385 in words is "one billion, two hundred forty million, three hundred ninety-six thousand, three hundred eighty-five".