1905660396434 has 32 divisors (see below), whose sum is σ = 3027875710464. Its totient is φ = 898097840640.

The previous prime is 1905660396397. The next prime is 1905660396439. The reversal of 1905660396434 is 4346930665091.

It is a self number, because there is not a number n which added to its sum of digits gives 1905660396434.

It is not an unprimeable number, because it can be changed into a prime (1905660396439) 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, 71369 + ... + 1953564.

It is an arithmetic number, because the mean of its divisors is an integer number (94621115952).

Almost surely, 2^{1905660396434} is an apocalyptic number.

1905660396434 is a deficient number, since it is larger than the sum of its proper divisors (1122215314030).

1905660396434 is a wasteful number, since it uses less digits than its factorization.

1905660396434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025362.

The product of its (nonzero) digits is 12597120, while the sum is 56.

The spelling of 1905660396434 in words is "one trillion, nine hundred five billion, six hundred sixty million, three hundred ninety-six thousand, four hundred thirty-four".