1940249520391 has 16 divisors (see below), whose sum is σ = 2411642979648. Its totient is φ = 1519943040000.

The previous prime is 1940249520373. The next prime is 1940249520397. The reversal of 1940249520391 is 1930259420491.

It is a happy number.

It is not a de Polignac number, because 1940249520391 - 2²³ = 1940241131783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940249520397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105542410 + ... + 105560791.

It is an arithmetic number, because the mean of its divisors is an integer number (150727686228).

Almost surely, 2^{1940249520391} is an apocalyptic number.

1940249520391 is a deficient number, since it is larger than the sum of its proper divisors (471393459257).

1940249520391 is a wasteful number, since it uses less digits than its factorization.

1940249520391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211103322.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 1940249520391 in words is "one trillion, nine hundred forty billion, two hundred forty-nine million, five hundred twenty thousand, three hundred ninety-one".