3945990 has 32 divisors (see below), whose sum is σ = 9778176. Its totient is φ = 1018080.

The previous prime is 3945983. The next prime is 3946027. The reversal of 3945990 is 995493.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1192 + ... + 3051.

It is an arithmetic number, because the mean of its divisors is an integer number (305568).

Almost surely, 2^3945990 is an apocalyptic number.

3945990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3945990 is an abundant number, since it is smaller than the sum of its proper divisors (5832186).

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

3945990 is a wasteful number, since it uses less digits than its factorization.

3945990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 3945990 is about 1986.4516102840. The cubic root of 3945990 is about 158.0224024209.

The spelling of 3945990 in words is "three million, nine hundred forty-five thousand, nine hundred ninety".