2657938 has 4 divisors (see below), whose sum is σ = 3986910. Its totient is φ = 1328968.

The previous prime is 2657911. The next prime is 2657939. The reversal of 2657938 is 8397562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8397562 = 2 ⋅4198781.

It can be written as a sum of positive squares in only one way, i.e., 2601769 + 56169 = 1613^2 + 237^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 2¹³ + 6⁴ + 5³ + 7² + 9⁶ + 3⁹ + 8⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 2657938.

It is not an unprimeable number, because it can be changed into a prime (2657939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664483 + ... + 664486.

2^2657938 is an apocalyptic number.

2657938 is a deficient number, since it is larger than the sum of its proper divisors (1328972).

2657938 is a wasteful number, since it uses less digits than its factorization.

2657938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328971.

The product of its digits is 90720, while the sum is 40.

The square root of 2657938 is about 1630.3183738154. The cubic root of 2657938 is about 138.5207864990.

The spelling of 2657938 in words is "two million, six hundred fifty-seven thousand, nine hundred thirty-eight".