2978138 has 4 divisors (see below), whose sum is σ = 4467210. Its totient is φ = 1489068.

The previous prime is 2978119. The next prime is 2978147. The reversal of 2978138 is 8318792.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2968729 + 9409 = 1723^2 + 97^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 744533 + ... + 744536.

2^2978138 is an apocalyptic number.

2978138 is a deficient number, since it is larger than the sum of its proper divisors (1489072).

2978138 is a wasteful number, since it uses less digits than its factorization.

2978138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489071.

The product of its digits is 24192, while the sum is 38.

The square root of 2978138 is about 1725.7282520722. The cubic root of 2978138 is about 143.8737641119.

The spelling of 2978138 in words is "two million, nine hundred seventy-eight thousand, one hundred thirty-eight".