1240198957 has 2 divisors, whose sum is σ = 1240198958. Its totient is φ = 1240198956.

The previous prime is 1240198937. The next prime is 1240198987. The reversal of 1240198957 is 7598910421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1134746596 + 105452361 = 33686^2 + 10269^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240198957 - 2⁷ = 1240198829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240198937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620099478 + 620099479.

It is an arithmetic number, because the mean of its divisors is an integer number (620099479).

Almost surely, 2^1240198957 is an apocalyptic number.

It is an amenable number.

1240198957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240198957 is an equidigital number, since it uses as much as digits as its factorization.

1240198957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 1240198957 is about 35216.4586095763. The cubic root of 1240198957 is about 1074.3945267550.

The spelling of 1240198957 in words is "one billion, two hundred forty million, one hundred ninety-eight thousand, nine hundred fifty-seven".