1640245 has 16 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 1179904.

The previous prime is 1640231. The next prime is 1640263. The reversal of 1640245 is 5420461.

It is a cyclic number.

It is not a de Polignac number, because 1640245 - 2⁹ = 1639733 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1536 + ... + 2374.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

2^1640245 is an apocalyptic number.

It is an amenable number.

1640245 is a deficient number, since it is larger than the sum of its proper divisors (537035).

1640245 is a wasteful number, since it uses less digits than its factorization.

1640245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1640245 is about 1280.7205003435. The cubic root of 1640245 is about 117.9332429066.

The spelling of 1640245 in words is "one million, six hundred forty thousand, two hundred forty-five".