1421798391 has 24 divisors (see below), whose sum is σ = 2222206896. Its totient is φ = 870791040.

The previous prime is 1421798347. The next prime is 1421798453. The reversal of 1421798391 is 1938971241.

It is not a de Polignac number, because 1421798391 - 2⁶ = 1421798327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421798591) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4110 + ... + 53483.

It is an arithmetic number, because the mean of its divisors is an integer number (92591954).

Almost surely, 2^1421798391 is an apocalyptic number.

1421798391 is a deficient number, since it is larger than the sum of its proper divisors (800408505).

1421798391 is a wasteful number, since it uses less digits than its factorization.

1421798391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57823 (or 57820 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1421798391 is about 37706.7419833642. The cubic root of 1421798391 is about 1124.4651656274.

The spelling of 1421798391 in words is "one billion, four hundred twenty-one million, seven hundred ninety-eight thousand, three hundred ninety-one".