1421688767 has 4 divisors (see below), whose sum is σ = 1505317536. Its totient is φ = 1338060000.

The previous prime is 1421688739. The next prime is 1421688773. The reversal of 1421688767 is 7678861241.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1421688767 - 2⁸ = 1421688511 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 (1421685767) 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, 41814359 + ... + 41814392.

It is an arithmetic number, because the mean of its divisors is an integer number (376329384).

Almost surely, 2^1421688767 is an apocalyptic number.

1421688767 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1421688767 is a deficient number, since it is larger than the sum of its proper divisors (83628769).

1421688767 is an equidigital number, since it uses as much as digits as its factorization.

1421688767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83628768.

The product of its digits is 903168, while the sum is 50.

The square root of 1421688767 is about 37705.2883160970. The cubic root of 1421688767 is about 1124.4362652483.

The spelling of 1421688767 in words is "one billion, four hundred twenty-one million, six hundred eighty-eight thousand, seven hundred sixty-seven".