1640097 has 6 divisors (see below), whose sum is σ = 2369042. Its totient is φ = 1093392.

The previous prime is 1640083. The next prime is 1640131. The reversal of 1640097 is 7900461.

It can be written as a sum of positive squares in only one way, i.e., 1535121 + 104976 = 1239^2 + 324^2 .

It is not a de Polignac number, because 1640097 - 2⁶ = 1640033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640097.

It is not an unprimeable number, because it can be changed into a prime (1640017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91108 + ... + 91125.

2^1640097 is an apocalyptic number.

It is an amenable number.

1640097 is a deficient number, since it is larger than the sum of its proper divisors (728945).

1640097 is a wasteful number, since it uses less digits than its factorization.

1640097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182239 (or 182236 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1640097 is about 1280.6627190638. The cubic root of 1640097 is about 117.9296957444.

The spelling of 1640097 in words is "one million, six hundred forty thousand, ninety-seven".