2657897389 has 4 divisors (see below), whose sum is σ = 3037597024. Its totient is φ = 2278197756.

The previous prime is 2657897339. The next prime is 2657897393. The reversal of 2657897389 is 9837987562.

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 2657897389 - 2⁹ = 2657896877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2657897389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2657897339) 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, 189849807 + ... + 189849820.

It is an arithmetic number, because the mean of its divisors is an integer number (759399256).

Almost surely, 2^2657897389 is an apocalyptic number.

It is an amenable number.

2657897389 is a deficient number, since it is larger than the sum of its proper divisors (379699635).

2657897389 is an equidigital number, since it uses as much as digits as its factorization.

2657897389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379699634.

The product of its digits is 45722880, while the sum is 64.

The square root of 2657897389 is about 51554.7998638342. The cubic root of 2657897389 is about 1385.2008100271.

The spelling of 2657897389 in words is "two billion, six hundred fifty-seven million, eight hundred ninety-seven thousand, three hundred eighty-nine".