1247993983 has 2 divisors, whose sum is σ = 1247993984. Its totient is φ = 1247993982.

The previous prime is 1247993977. The next prime is 1247993993. The reversal of 1247993983 is 3893997421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1247993983 - 2²¹ = 1245896831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247993963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623996991 + 623996992.

It is an arithmetic number, because the mean of its divisors is an integer number (623996992).

Almost surely, 2^1247993983 is an apocalyptic number.

1247993983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247993983 is an equidigital number, since it uses as much as digits as its factorization.

1247993983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 55.

The square root of 1247993983 is about 35326.9583038223. The cubic root of 1247993983 is about 1076.6407921374.

The spelling of 1247993983 in words is "one billion, two hundred forty-seven million, nine hundred ninety-three thousand, nine hundred eighty-three".