1974240643 has 2 divisors, whose sum is σ = 1974240644. Its totient is φ = 1974240642.

The previous prime is 1974240623. The next prime is 1974240647. The reversal of 1974240643 is 3460424791.

It is a strong prime.

It is an emirp because it is prime and its reverse (3460424791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1974240643 - 2⁹ = 1974240131 is a prime.

It is a super-2 number, since 2×1974240643² = 7795252232946106898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1974240596 and 1974240605.

It is not a weakly prime, because it can be changed into another prime (1974240647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987120321 + 987120322.

It is an arithmetic number, because the mean of its divisors is an integer number (987120322).

Almost surely, 2^1974240643 is an apocalyptic number.

1974240643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974240643 is an equidigital number, since it uses as much as digits as its factorization.

1974240643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 1974240643 is about 44432.4278314836. The cubic root of 1974240643 is about 1254.4885336673.

The spelling of 1974240643 in words is "one billion, nine hundred seventy-four million, two hundred forty thousand, six hundred forty-three".