1640265 has 16 divisors (see below), whose sum is σ = 2863296. Its totient is φ = 795200.

The previous prime is 1640263. The next prime is 1640267. The reversal of 1640265 is 5620461.

It is an interprime number because it is at equal distance from previous prime (1640263) and next prime (1640267).

It is not a de Polignac number, because 1640265 - 2¹ = 1640263 is a prime.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4806 + ... + 5135.

It is an arithmetic number, because the mean of its divisors is an integer number (178956).

2^1640265 is an apocalyptic number.

1640265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640265 is a deficient number, since it is larger than the sum of its proper divisors (1223031).

1640265 is a wasteful number, since it uses less digits than its factorization.

1640265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9960.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1640265 is about 1280.7283084245. The cubic root of 1640265 is about 117.9337222364.

The spelling of 1640265 in words is "one million, six hundred forty thousand, two hundred sixty-five".