2331978 has 32 divisors (see below), whose sum is σ = 5158080. Its totient is φ = 696960.

The previous prime is 2331949. The next prime is 2331997. The reversal of 2331978 is 8791332.

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

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5676 + ... + 6072.

It is an arithmetic number, because the mean of its divisors is an integer number (161190).

2^2331978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2331978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2579040).

2331978 is an abundant number, since it is smaller than the sum of its proper divisors (2826102).

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

2331978 is a wasteful number, since it uses less digits than its factorization.

2331978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

The product of its digits is 9072, while the sum is 33.

The square root of 2331978 is about 1527.0815302400. The cubic root of 2331978 is about 132.6095545804.

It can be divided in two parts, 233 and 1978, that added together give a triangular number (2211 = T₆₆).

The spelling of 2331978 in words is "two million, three hundred thirty-one thousand, nine hundred seventy-eight".