2978389 has 8 divisors (see below), whose sum is σ = 3093048. Its totient is φ = 2865600.

The previous prime is 2978377. The next prime is 2978399. The reversal of 2978389 is 9838792.

It can be written as a sum of positive squares in 4 ways, for example, as 1844164 + 1134225 = 1358^2 + 1065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2978389 - 2⁵ = 2978357 is a prime.

It is a super-4 number, since 4×2978389⁴ (a number of 27 digits) contains 4444 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3339 + ... + 4135.

It is an arithmetic number, because the mean of its divisors is an integer number (386631).

2^2978389 is an apocalyptic number.

It is an amenable number.

2978389 is a deficient number, since it is larger than the sum of its proper divisors (114659).

2978389 is a wasteful number, since it uses less digits than its factorization.

2978389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935.

The product of its digits is 217728, while the sum is 46.

The square root of 2978389 is about 1725.8009734613. The cubic root of 2978389 is about 143.8778059327.

The spelling of 2978389 in words is "two million, nine hundred seventy-eight thousand, three hundred eighty-nine".