1640253 has 8 divisors (see below), whose sum is σ = 2233728. Its totient is φ = 1070144.

The previous prime is 1640231. The next prime is 1640263. The reversal of 1640253 is 3520461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640253 - 2⁶ = 1640189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5676 + ... + 5957.

It is an arithmetic number, because the mean of its divisors is an integer number (279216).

2^1640253 is an apocalyptic number.

It is an amenable number.

1640253 is a deficient number, since it is larger than the sum of its proper divisors (593475).

1640253 is a wasteful number, since it uses less digits than its factorization.

1640253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11683.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1640253 is about 1280.7236235816. The cubic root of 1640253 is about 117.9334346390.

The spelling of 1640253 in words is "one million, six hundred forty thousand, two hundred fifty-three".