1999964 has 12 divisors (see below), whose sum is σ = 3544800. Its totient is φ = 987168.

The previous prime is 1999957. The next prime is 1999969. The reversal of 1999964 is 4699991.

It is an Ulam number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999969) 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, 2849 + ... + 3480.

It is an arithmetic number, because the mean of its divisors is an integer number (295400).

2^1999964 is an apocalyptic number.

It is an amenable number.

1999964 is a deficient number, since it is larger than the sum of its proper divisors (1544836).

1999964 is a wasteful number, since it uses less digits than its factorization.

1999964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412 (or 6410 counting only the distinct ones).

The product of its digits is 157464, while the sum is 47.

The square root of 1999964 is about 1414.2008343938. The cubic root of 1999964 is about 125.9913490323.

The spelling of 1999964 in words is "one million, nine hundred ninety-nine thousand, nine hundred sixty-four".