3989895 has 64 divisors (see below), whose sum is σ = 8171520. Its totient is φ = 1617408.

The previous prime is 3989891. The next prime is 3989897. The reversal of 3989895 is 5989893.

3989895 = 220² + 221² + ... + 282².

It is not a de Polignac number, because 3989895 - 2² = 3989891 is a prime.

It is a super-2 number, since 2×3989895² = 31838524222050, which contains 22 as substring.

Its product of digits (699840) is a multiple of the sum of its prime divisors (144).

3989895 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50466 + ... + 50544.

It is an arithmetic number, because the mean of its divisors is an integer number (127680).

Almost surely, 2^3989895 is an apocalyptic number.

3989895 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3989895 is an abundant number, since it is smaller than the sum of its proper divisors (4181625).

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

3989895 is a wasteful number, since it uses less digits than its factorization.

3989895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144.

The product of its digits is 699840, while the sum is 51.

The square root of 3989895 is about 1997.4721524968. The cubic root of 3989895 is about 158.6063200784.

It can be divided in two parts, 39898 and 95, that added together give a palindrome (39993).

The spelling of 3989895 in words is "three million, nine hundred eighty-nine thousand, eight hundred ninety-five".