1421947917 has 36 divisors (see below), whose sum is σ = 2271507264. Its totient is φ = 856383840.

The previous prime is 1421947889. The next prime is 1421947921. The reversal of 1421947917 is 7197491241.

It is not a de Polignac number, because 1421947917 - 2¹⁰ = 1421946893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421947997) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 61542 + ... + 81432.

It is an arithmetic number, because the mean of its divisors is an integer number (63097424).

Almost surely, 2^1421947917 is an apocalyptic number.

It is an amenable number.

1421947917 is a deficient number, since it is larger than the sum of its proper divisors (849559347).

1421947917 is a wasteful number, since it uses less digits than its factorization.

1421947917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19970 (or 19954 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 1421947917 is about 37708.7246801055. The cubic root of 1421947917 is about 1124.5045830501.

The spelling of 1421947917 in words is "one billion, four hundred twenty-one million, nine hundred forty-seven thousand, nine hundred seventeen".