1268787421 has 8 divisors (see below), whose sum is σ = 1384645824. Its totient is φ = 1153014720.

The previous prime is 1268787379. The next prime is 1268787467. The reversal of 1268787421 is 1247878621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1268787421 - 2¹³ = 1268779229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268787721) 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, 11781 + ... + 51733.

It is an arithmetic number, because the mean of its divisors is an integer number (173080728).

Almost surely, 2^1268787421 is an apocalyptic number.

1268787421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1268787421 is a deficient number, since it is larger than the sum of its proper divisors (115858403).

1268787421 is a wasteful number, since it uses less digits than its factorization.

1268787421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42851.

The product of its digits is 301056, while the sum is 46.

The square root of 1268787421 is about 35620.0424059265. The cubic root of 1268787421 is about 1082.5873667145.

The spelling of 1268787421 in words is "one billion, two hundred sixty-eight million, seven hundred eighty-seven thousand, four hundred twenty-one".