3990745 has 8 divisors (see below), whose sum is σ = 5224320. Its totient is φ = 2902320.

The previous prime is 3990737. The next prime is 3990761. The reversal of 3990745 is 5470993.

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

It is not a de Polignac number, because 3990745 - 2³ = 3990737 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36225 + ... + 36334.

It is an arithmetic number, because the mean of its divisors is an integer number (653040).

Almost surely, 2^3990745 is an apocalyptic number.

It is an amenable number.

3990745 is a deficient number, since it is larger than the sum of its proper divisors (1233575).

3990745 is a wasteful number, since it uses less digits than its factorization.

3990745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72575.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 3990745 is about 1997.6849100897. The cubic root of 3990745 is about 158.6175823463.

The spelling of 3990745 in words is "three million, nine hundred ninety thousand, seven hundred forty-five".