1501985 has 4 divisors (see below), whose sum is σ = 1802388. Its totient is φ = 1201584.

The previous prime is 1501961. The next prime is 1501999. The reversal of 1501985 is 5891051.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165649 + 1336336 = 407^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 1501985 - 2⁶ = 1501921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 150194 + ... + 150203.

It is an arithmetic number, because the mean of its divisors is an integer number (450597).

2^1501985 is an apocalyptic number.

It is an amenable number.

1501985 is a deficient number, since it is larger than the sum of its proper divisors (300403).

1501985 is an equidigital number, since it uses as much as digits as its factorization.

1501985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300402.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1501985 is about 1225.5549763271. The cubic root of 1501985 is about 114.5218966151.

The spelling of 1501985 in words is "one million, five hundred one thousand, nine hundred eighty-five".