1640955 has 8 divisors (see below), whose sum is σ = 2625552. Its totient is φ = 875168.

The previous prime is 1640953. The next prime is 1640971. The reversal of 1640955 is 5590461.

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 1640955 - 2¹ = 1640953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54684 + ... + 54713.

It is an arithmetic number, because the mean of its divisors is an integer number (328194).

2^1640955 is an apocalyptic number.

1640955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1640955 is a deficient number, since it is larger than the sum of its proper divisors (984597).

1640955 is a wasteful number, since it uses less digits than its factorization.

1640955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109405.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1640955 is about 1280.9976580775. The cubic root of 1640955 is about 117.9502567315.

The spelling of 1640955 in words is "one million, six hundred forty thousand, nine hundred fifty-five".