1972140249 has 4 divisors (see below), whose sum is σ = 2629520336. Its totient is φ = 1314760164.

The previous prime is 1972140239. The next prime is 1972140251. The reversal of 1972140249 is 9420412791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1972140249 - 2⁸ = 1972139993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1972140239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328690039 + ... + 328690044.

It is an arithmetic number, because the mean of its divisors is an integer number (657380084).

Almost surely, 2^1972140249 is an apocalyptic number.

It is an amenable number.

1972140249 is a deficient number, since it is larger than the sum of its proper divisors (657380087).

1972140249 is an equidigital number, since it uses as much as digits as its factorization.

1972140249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657380086.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1972140249 is about 44408.7857185940. The cubic root of 1972140249 is about 1254.0434924846.

The spelling of 1972140249 in words is "one billion, nine hundred seventy-two million, one hundred forty thousand, two hundred forty-nine".