3990045 has 8 divisors (see below), whose sum is σ = 6384096. Its totient is φ = 2128016.

The previous prime is 3990037. The next prime is 3990047. The reversal of 3990045 is 5400993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3990045 - 2³ = 3990037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3989994 and 3990021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132987 + ... + 133016.

It is an arithmetic number, because the mean of its divisors is an integer number (798012).

Almost surely, 2^3990045 is an apocalyptic number.

It is an amenable number.

3990045 is a deficient number, since it is larger than the sum of its proper divisors (2394051).

3990045 is a wasteful number, since it uses less digits than its factorization.

3990045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266011.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 3990045 is about 1997.5096996010. The cubic root of 3990045 is about 158.6083076536.

The spelling of 3990045 in words is "three million, nine hundred ninety thousand, forty-five".