3291990 has 64 divisors (see below), whose sum is σ = 8902656. Its totient is φ = 772992.

The previous prime is 3291979. The next prime is 3291991. The reversal of 3291990 is 991923.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3291991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8787 + ... + 9153.

It is an arithmetic number, because the mean of its divisors is an integer number (139104).

Almost surely, 2^3291990 is an apocalyptic number.

3291990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3291990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4451328).

3291990 is an abundant number, since it is smaller than the sum of its proper divisors (5610666).

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

3291990 is a wasteful number, since it uses less digits than its factorization.

3291990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 3291990 is about 1814.3841930528. The cubic root of 3291990 is about 148.7599997985.

The spelling of 3291990 in words is "three million, two hundred ninety-one thousand, nine hundred ninety".