1958985 has 40 divisors (see below), whose sum is σ = 4019136. Its totient is φ = 894240.

The previous prime is 1958959. The next prime is 1958993. The reversal of 1958985 is 5898591.

It is not a de Polignac number, because 1958985 - 2¹² = 1954889 is a prime.

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

1958985 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1958985.

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 in 39 ways as a sum of consecutive naturals, for example, 2490 + ... + 3180.

2^1958985 is an apocalyptic number.

1958985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1958985 is an abundant number, since it is smaller than the sum of its proper divisors (2060151).

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

1958985 is an equidigital number, since it uses as much as digits as its factorization.

1958985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 706 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The square root of 1958985 is about 1399.6374530570. The cubic root of 1958985 is about 125.1248885146.

It can be divided in two parts, 195 and 8985, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 1958985 in words is "one million, nine hundred fifty-eight thousand, nine hundred eighty-five".