1985414805 has 24 divisors (see below), whose sum is σ = 3754239840. Its totient is φ = 962625120.

The previous prime is 1985414801. The next prime is 1985414831. The reversal of 1985414805 is 5084145891.

It is a happy number.

It is not a de Polignac number, because 1985414805 - 2² = 1985414801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985414801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2004975 + ... + 2005964.

It is an arithmetic number, because the mean of its divisors is an integer number (156426660).

Almost surely, 2^1985414805 is an apocalyptic number.

1985414805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1985414805 is a deficient number, since it is larger than the sum of its proper divisors (1768825035).

1985414805 is a wasteful number, since it uses less digits than its factorization.

1985414805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010961 (or 4010958 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 1985414805 is about 44557.9937272764. The cubic root of 1985414805 is about 1256.8508755411.

The spelling of 1985414805 in words is "one billion, nine hundred eighty-five million, four hundred fourteen thousand, eight hundred five".