1971794215 has 48 divisors (see below), whose sum is σ = 2625333120. Its totient is φ = 1416576000.

The previous prime is 1971794213. The next prime is 1971794239. The reversal of 1971794215 is 5124971791.

It is not a de Polignac number, because 1971794215 - 2¹ = 1971794213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971794213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8250066 + ... + 8250304.

It is an arithmetic number, because the mean of its divisors is an integer number (54694440).

Almost surely, 2^1971794215 is an apocalyptic number.

1971794215 is a deficient number, since it is larger than the sum of its proper divisors (653538905).

1971794215 is a wasteful number, since it uses less digits than its factorization.

1971794215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 393 counting only the distinct ones).

The product of its digits is 158760, while the sum is 46.

The square root of 1971794215 is about 44404.8895393289. The cubic root of 1971794215 is about 1253.9701428891.

The spelling of 1971794215 in words is "one billion, nine hundred seventy-one million, seven hundred ninety-four thousand, two hundred fifteen".