1240660421 has 16 divisors (see below), whose sum is σ = 1665783168. Its totient is φ = 892382400.

The previous prime is 1240660417. The next prime is 1240660429.

1240660421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1240660421 - 2² = 1240660417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240660429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 618710 + ... + 620711.

It is an arithmetic number, because the mean of its divisors is an integer number (104111448).

Almost surely, 2^1240660421 is an apocalyptic number.

1240660421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1240660421 is a deficient number, since it is larger than the sum of its proper divisors (425122747).

1240660421 is a wasteful number, since it uses less digits than its factorization.

1240660421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239452.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1240660421 is about 35223.0098231256. The cubic root of 1240660421 is about 1074.5277669132.

It can be divided in two parts, 12406 and 60421, that added together give a palindrome (72827).

The spelling of 1240660421 in words is "one billion, two hundred forty million, six hundred sixty thousand, four hundred twenty-one".