3909997 has 8 divisors (see below), whose sum is σ = 4812416. Its totient is φ = 3093552.

The previous prime is 3909979. The next prime is 3910001. The reversal of 3909997 is 7999093.

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

It is not a de Polignac number, because 3909997 - 2¹¹ = 3907949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909907) 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, 21393 + ... + 21574.

It is an arithmetic number, because the mean of its divisors is an integer number (601552).

Almost surely, 2^3909997 is an apocalyptic number.

It is an amenable number.

3909997 is a deficient number, since it is larger than the sum of its proper divisors (902419).

3909997 is a wasteful number, since it uses less digits than its factorization.

3909997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42987.

The product of its (nonzero) digits is 137781, while the sum is 46.

The square root of 3909997 is about 1977.3712347458. The cubic root of 3909997 is about 157.5404716688.

The spelling of 3909997 in words is "three million, nine hundred nine thousand, nine hundred ninety-seven".