1985427164 has 12 divisors (see below), whose sum is σ = 3970854384. Its totient is φ = 850897344.

The previous prime is 1985427163. The next prime is 1985427193. The reversal of 1985427164 is 4617245891.

It is a happy number.

1985427164 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985427163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35454029 + ... + 35454084.

It is an arithmetic number, because the mean of its divisors is an integer number (330904532).

Almost surely, 2^1985427164 is an apocalyptic number.

1985427164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1985427164 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1985427164 is a wasteful number, since it uses less digits than its factorization.

1985427164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70908124 (or 70908122 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The square root of 1985427164 is about 44558.1324114914. The cubic root of 1985427164 is about 1256.8534834575.

The spelling of 1985427164 in words is "one billion, nine hundred eighty-five million, four hundred twenty-seven thousand, one hundred sixty-four".