1260408421 has 4 divisors (see below), whose sum is σ = 1268141152. Its totient is φ = 1252675692.

The previous prime is 1260408379. The next prime is 1260408431. The reversal of 1260408421 is 1248040621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1260408421 - 2¹⁷ = 1260277349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1260408421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260408431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3866121 + ... + 3866446.

It is an arithmetic number, because the mean of its divisors is an integer number (317035288).

Almost surely, 2^1260408421 is an apocalyptic number.

It is an amenable number.

1260408421 is a deficient number, since it is larger than the sum of its proper divisors (7732731).

1260408421 is an equidigital number, since it uses as much as digits as its factorization.

1260408421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732730.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 1260408421 is about 35502.2312115732. The cubic root of 1260408421 is about 1080.1989862547.

The spelling of 1260408421 in words is "one billion, two hundred sixty million, four hundred eight thousand, four hundred twenty-one".