1260665406 has 384 divisors, whose sum is σ = 3951747072. Its totient is φ = 279936000.

The previous prime is 1260665387. The next prime is 1260665407. The reversal of 1260665406 is 6045660621.

It is a happy number.

1260665406 is a `hidden beast` number, since 1 + 2 + 606 + 6 + 5 + 40 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260665407) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 20666616 + ... + 20666676.

It is an arithmetic number, because the mean of its divisors is an integer number (10291008).

Almost surely, 2^1260665406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1260665406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1975873536).

1260665406 is an abundant number, since it is smaller than the sum of its proper divisors (2691081666).

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

1260665406 is a wasteful number, since it uses less digits than its factorization.

1260665406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1260665406 is about 35505.8503066748. The cubic root of 1260665406 is about 1080.2723952830.

It can be divided in two parts, 1260 and 665406, that added together give a palindrome (666666).

The spelling of 1260665406 in words is "one billion, two hundred sixty million, six hundred sixty-five thousand, four hundred six".