1240020553 has 8 divisors (see below), whose sum is σ = 1314617600. Its totient is φ = 1167585840.

The previous prime is 1240020547. The next prime is 1240020589. The reversal of 1240020553 is 3550200421.

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 1240020553 - 2¹⁷ = 1239889481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240020533) 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, 539403 + ... + 541696.

It is an arithmetic number, because the mean of its divisors is an integer number (164327200).

Almost surely, 2^1240020553 is an apocalyptic number.

It is an amenable number.

1240020553 is a deficient number, since it is larger than the sum of its proper divisors (74597047).

1240020553 is a wasteful number, since it uses less digits than its factorization.

1240020553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081167.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 1240020553 is about 35213.9255550982. The cubic root of 1240020553 is about 1074.3430066685.

Adding to 1240020553 its reverse (3550200421), we get a palindrome (4790220974).

The spelling of 1240020553 in words is "one billion, two hundred forty million, twenty thousand, five hundred fifty-three".