1240920993 has 8 divisors (see below), whose sum is σ = 1781835328. Its totient is φ = 763643664.

The previous prime is 1240920907. The next prime is 1240921013. The reversal of 1240920993 is 3990290421.

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

It is not a de Polignac number, because 1240920993 - 2⁹ = 1240920481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 31818487 = 1240920993 / (1 + 2 + 4 + 0 + 9 + 2 + 0 + 9 + 9 + 3).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1240920293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15909205 + ... + 15909282.

It is an arithmetic number, because the mean of its divisors is an integer number (222729416).

Almost surely, 2^1240920993 is an apocalyptic number.

1240920993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1240920993 is a deficient number, since it is larger than the sum of its proper divisors (540914335).

1240920993 is a wasteful number, since it uses less digits than its factorization.

1240920993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31818503.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 1240920993 is about 35226.7085178278. The cubic root of 1240920993 is about 1074.6029882079.

The spelling of 1240920993 in words is "one billion, two hundred forty million, nine hundred twenty thousand, nine hundred ninety-three".