1240420664 has 16 divisors (see below), whose sum is σ = 2658044400. Its totient is φ = 531608832.

The previous prime is 1240420651. The next prime is 1240420667. The reversal of 1240420664 is 4660240421.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240420667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11075129 + ... + 11075240.

It is an arithmetic number, because the mean of its divisors is an integer number (166127775).

Almost surely, 2^1240420664 is an apocalyptic number.

1240420664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1240420664 is an abundant number, since it is smaller than the sum of its proper divisors (1417623736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1240420664 is a wasteful number, since it uses less digits than its factorization.

1240420664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22150382 (or 22150378 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 1240420664 is about 35219.6062442498. The cubic root of 1240420664 is about 1074.4585451378.

The spelling of 1240420664 in words is "one billion, two hundred forty million, four hundred twenty thousand, six hundred sixty-four".