2009657 has 4 divisors (see below), whose sum is σ = 2164260. Its totient is φ = 1855056.

The previous prime is 2009647. The next prime is 2009669. The reversal of 2009657 is 7569002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 712336 + 1297321 = 844^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009657 - 2⁶ = 2009593 is a prime.

It is a super-3 number, since 3×2009657³ = 24349333339449349179, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2009647) 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, 77282 + ... + 77307.

It is an arithmetic number, because the mean of its divisors is an integer number (541065).

2^2009657 is an apocalyptic number.

It is an amenable number.

2009657 is a deficient number, since it is larger than the sum of its proper divisors (154603).

2009657 is a wasteful number, since it uses less digits than its factorization.

2009657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154602.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 2009657 is about 1417.6237159416. The cubic root of 2009657 is about 126.1945637739.

The spelling of 2009657 in words is "two million, nine thousand, six hundred fifty-seven".