1305988 has 6 divisors (see below), whose sum is σ = 2285486. Its totient is φ = 652992.

The previous prime is 1305971. The next prime is 1306001. The reversal of 1305988 is 8895031.

It can be written as a sum of positive squares in only one way, i.e., 1119364 + 186624 = 1058^2 + 432^2 .

It is a super-2 number, since 2×1305988² = 3411209312288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163245 + ... + 163252.

2^1305988 is an apocalyptic number.

It is an amenable number.

1305988 is a deficient number, since it is larger than the sum of its proper divisors (979498).

1305988 is a wasteful number, since it uses less digits than its factorization.

1305988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326501 (or 326499 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1305988 is about 1142.7983199148. The cubic root of 1305988 is about 109.3066024611.

The spelling of 1305988 in words is "one million, three hundred five thousand, nine hundred eighty-eight".