3121890 has 32 divisors (see below), whose sum is σ = 7888320. Its totient is φ = 788544.

The previous prime is 3121873. The next prime is 3121891. The reversal of 3121890 is 981213.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121890.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121891) 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, 2169 + ... + 3308.

It is an arithmetic number, because the mean of its divisors is an integer number (246510).

Almost surely, 2^3121890 is an apocalyptic number.

3121890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3121890 is an abundant number, since it is smaller than the sum of its proper divisors (4766430).

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

3121890 is a wasteful number, since it uses less digits than its factorization.

3121890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5506.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 3121890 is about 1766.8870931670. The cubic root of 3121890 is about 146.1523711052.

The spelling of 3121890 in words is "three million, one hundred twenty-one thousand, eight hundred ninety".