2291988 has 24 divisors (see below), whose sum is σ = 5372640. Its totient is φ = 760480.

The previous prime is 2291987. The next prime is 2291999. The reversal of 2291988 is 8891922.

2291988 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291983) 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, 4423 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (223860).

2^2291988 is an apocalyptic number.

It is an amenable number.

2291988 is an abundant number, since it is smaller than the sum of its proper divisors (3080652).

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

2291988 is a wasteful number, since it uses less digits than its factorization.

2291988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 885 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 2291988 is about 1513.9313062355. The cubic root of 2291988 is about 131.8471601048.

The spelling of 2291988 in words is "two million, two hundred ninety-one thousand, nine hundred eighty-eight".