1985149445 has 8 divisors (see below), whose sum is σ = 2405765880. Its totient is φ = 1572395200.

The previous prime is 1985149433. The next prime is 1985149447. The reversal of 1985149445 is 5449415891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 576048001 + 1409101444 = 24001^2 + 37538^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1985149445 - 2¹⁶ = 1985083909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1985149393 and 1985149402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985149447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1964990 + ... + 1965999.

It is an arithmetic number, because the mean of its divisors is an integer number (300720735).

Almost surely, 2^1985149445 is an apocalyptic number.

It is an amenable number.

1985149445 is a deficient number, since it is larger than the sum of its proper divisors (420616435).

1985149445 is a wasteful number, since it uses less digits than its factorization.

1985149445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931095.

The product of its digits is 1036800, while the sum is 50.

The square root of 1985149445 is about 44555.0159353579. The cubic root of 1985149445 is about 1256.7948783749.

It can be divided in two parts, 19851 and 49445, that added together give a palindrome (69296).

The spelling of 1985149445 in words is "one billion, nine hundred eighty-five million, one hundred forty-nine thousand, four hundred forty-five".