1973974257 has 6 divisors (see below), whose sum is σ = 2851296162. Its totient is φ = 1315982832.

The previous prime is 1973974237. The next prime is 1973974271. The reversal of 1973974257 is 7524793791.

It can be written as a sum of positive squares in only one way, i.e., 1212710976 + 761263281 = 34824^2 + 27591^2 .

It is not a de Polignac number, because 1973974257 - 2⁷ = 1973974129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1973974217) 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 5 ways as a sum of consecutive naturals, for example, 109665228 + ... + 109665245.

It is an arithmetic number, because the mean of its divisors is an integer number (475216027).

Almost surely, 2^1973974257 is an apocalyptic number.

It is an amenable number.

1973974257 is a deficient number, since it is larger than the sum of its proper divisors (877321905).

1973974257 is a wasteful number, since it uses less digits than its factorization.

1973974257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219330479 (or 219330476 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 54.

The square root of 1973974257 is about 44429.4300773710. The cubic root of 1973974257 is about 1254.4321080546.

The spelling of 1973974257 in words is "one billion, nine hundred seventy-three million, nine hundred seventy-four thousand, two hundred fifty-seven".