2978390 has 16 divisors (see below), whose sum is σ = 5476032. Its totient is φ = 1165824.

The previous prime is 2978377. The next prime is 2978399. The reversal of 2978390 is 938792.

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, 2699 + ... + 3638.

It is an arithmetic number, because the mean of its divisors is an integer number (342252).

2^2978390 is an apocalyptic number.

2978390 is a deficient number, since it is larger than the sum of its proper divisors (2497642).

2978390 is a wasteful number, since it uses less digits than its factorization.

2978390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6391.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2978390 is about 1725.8012631818. The cubic root of 2978390 is about 143.8778220352.

The spelling of 2978390 in words is "two million, nine hundred seventy-eight thousand, three hundred ninety".