1421591647 has 24 divisors (see below), whose sum is σ = 1756635552. Its totient is φ = 1126137600.

The previous prime is 1421591627. The next prime is 1421591669. The reversal of 1421591647 is 7461951241.

It is a happy number.

It is not a de Polignac number, because 1421591647 - 2¹⁹ = 1421067359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421591627) 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, 96747 + ... + 110467.

It is an arithmetic number, because the mean of its divisors is an integer number (73193148).

Almost surely, 2^1421591647 is an apocalyptic number.

1421591647 is a deficient number, since it is larger than the sum of its proper divisors (335043905).

1421591647 is a wasteful number, since it uses less digits than its factorization.

1421591647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13807 (or 13788 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 1421591647 is about 37704.0004110970. Note that the first 3 decimals coincide. The cubic root of 1421591647 is about 1124.4106600809.

The spelling of 1421591647 in words is "one billion, four hundred twenty-one million, five hundred ninety-one thousand, six hundred forty-seven".