1972821249 has 24 divisors (see below), whose sum is σ = 3262564032. Its totient is φ = 1125303840.

The previous prime is 1972821247. The next prime is 1972821269. The reversal of 1972821249 is 9421282791.

It is not a de Polignac number, because 1972821249 - 2¹ = 1972821247 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1972821247) 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, 7659 + ... + 63279.

It is an arithmetic number, because the mean of its divisors is an integer number (135940168).

Almost surely, 2^1972821249 is an apocalyptic number.

It is an amenable number.

1972821249 is a deficient number, since it is larger than the sum of its proper divisors (1289742783).

1972821249 is a wasteful number, since it uses less digits than its factorization.

1972821249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56197 (or 56194 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1972821249 is about 44416.4524585204. The cubic root of 1972821249 is about 1254.1878205125.

The spelling of 1972821249 in words is "one billion, nine hundred seventy-two million, eight hundred twenty-one thousand, two hundred forty-nine".