1945864 has 8 divisors (see below), whose sum is σ = 3648510. Its totient is φ = 972928.

The previous prime is 1945859. The next prime is 1945873. The reversal of 1945864 is 4685491.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1512900 + 432964 = 1230^2 + 658^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121609 + ... + 121624.

2^1945864 is an apocalyptic number.

It is an amenable number.

1945864 is a deficient number, since it is larger than the sum of its proper divisors (1702646).

1945864 is a wasteful number, since it uses less digits than its factorization.

1945864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243239 (or 243235 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 1945864 is about 1394.9422927132. The cubic root of 1945864 is about 124.8449063138.

It can be divided in two parts, 1945 and 864, that added together give a square (2809 = 53²).

The spelling of 1945864 in words is "one million, nine hundred forty-five thousand, eight hundred sixty-four".