2978393 has 4 divisors (see below), whose sum is σ = 3249168. Its totient is φ = 2707620.

The previous prime is 2978377. The next prime is 2978399. The reversal of 2978393 is 3938792.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2978393 - 2⁴ = 2978377 is a prime.

It is a Duffinian number.

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 2978393.

It is not an unprimeable number, because it can be changed into a prime (2978399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135371 + ... + 135392.

It is an arithmetic number, because the mean of its divisors is an integer number (812292).

2^2978393 is an apocalyptic number.

It is an amenable number.

2978393 is a deficient number, since it is larger than the sum of its proper divisors (270775).

2978393 is a wasteful number, since it uses less digits than its factorization.

2978393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270774.

The product of its digits is 81648, while the sum is 41.

The square root of 2978393 is about 1725.8021323431. The cubic root of 2978393 is about 143.8778703424.

The spelling of 2978393 in words is "two million, nine hundred seventy-eight thousand, three hundred ninety-three".