1940249520397 has 2 divisors, whose sum is σ = 1940249520398. Its totient is φ = 1940249520396.

The previous prime is 1940249520373. The next prime is 1940249520449. The reversal of 1940249520397 is 7930259420491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1679898539881 + 260350980516 = 1296109^2 + 510246^2 .

It is a cyclic number.

It is not a de Polignac number, because 1940249520397 - 2¹⁵ = 1940249487629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1940249523397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970124760198 + 970124760199.

It is an arithmetic number, because the mean of its divisors is an integer number (970124760199).

Almost surely, 2^{1940249520397} is an apocalyptic number.

It is an amenable number.

1940249520397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940249520397 is an equidigital number, since it uses as much as digits as its factorization.

1940249520397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 1940249520397 in words is "one trillion, nine hundred forty billion, two hundred forty-nine million, five hundred twenty thousand, three hundred ninety-seven".