840397849435 has 16 divisors (see below), whose sum is σ = 1019232398016. Its totient is φ = 665153169408.

The previous prime is 840397849433. The next prime is 840397849471. The reversal of 840397849435 is 534948793048.

It is a cyclic number.

It is not a de Polignac number, because 840397849435 - 2¹ = 840397849433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840397849433) 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, 1082394 + ... + 1688896.

It is an arithmetic number, because the mean of its divisors is an integer number (63702024876).

Almost surely, 2^840397849435 is an apocalyptic number.

840397849435 is a deficient number, since it is larger than the sum of its proper divisors (178834548581).

840397849435 is a wasteful number, since it uses less digits than its factorization.

840397849435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609462.

The product of its (nonzero) digits is 104509440, while the sum is 64.

The spelling of 840397849435 in words is "eight hundred forty billion, three hundred ninety-seven million, eight hundred forty-nine thousand, four hundred thirty-five".