3121998 has 16 divisors (see below), whose sum is σ = 6811776. Its totient is φ = 946040.

The previous prime is 3121981. The next prime is 3122003. The reversal of 3121998 is 8991213.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 23586 + ... + 23717.

It is an arithmetic number, because the mean of its divisors is an integer number (425736).

Almost surely, 2^3121998 is an apocalyptic number.

3121998 is an abundant number, since it is smaller than the sum of its proper divisors (3689778).

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

3121998 is a wasteful number, since it uses less digits than its factorization.

3121998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47319.

The product of its digits is 3888, while the sum is 33.

The square root of 3121998 is about 1766.9176551271. The cubic root of 3121998 is about 146.1540564384.

The spelling of 3121998 in words is "three million, one hundred twenty-one thousand, nine hundred ninety-eight".