3931998 has 32 divisors (see below), whose sum is σ = 9517824. Its totient is φ = 1057152.

The previous prime is 3931997. The next prime is 3932003. The reversal of 3931998 is 8991393.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2040 + ... + 3467.

It is an arithmetic number, because the mean of its divisors is an integer number (297432).

Almost surely, 2^3931998 is an apocalyptic number.

3931998 is an abundant number, since it is smaller than the sum of its proper divisors (5585826).

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

3931998 is a wasteful number, since it uses less digits than its factorization.

3931998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5536.

The product of its digits is 52488, while the sum is 42.

The square root of 3931998 is about 1982.9266249662. The cubic root of 3931998 is about 157.8354051582.

The spelling of 3931998 in words is "three million, nine hundred thirty-one thousand, nine hundred ninety-eight".