1985904742229 has 4 divisors (see below), whose sum is σ = 2015545111584. Its totient is φ = 1956264372876.

The previous prime is 1985904742219. The next prime is 1985904742247. The reversal of 1985904742229 is 9222474095891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1985904742229 - 2³⁶ = 1917185265493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985904742219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14820184577 + ... + 14820184710.

It is an arithmetic number, because the mean of its divisors is an integer number (503886277896).

Almost surely, 2^{1985904742229} is an apocalyptic number.

It is an amenable number.

1985904742229 is a deficient number, since it is larger than the sum of its proper divisors (29640369355).

1985904742229 is an equidigital number, since it uses as much as digits as its factorization.

1985904742229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29640369354.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 1985904742229 in words is "one trillion, nine hundred eighty-five billion, nine hundred four million, seven hundred forty-two thousand, two hundred twenty-nine".