1640901 has 4 divisors (see below), whose sum is σ = 2187872. Its totient is φ = 1093932.

The previous prime is 1640887. The next prime is 1640927. The reversal of 1640901 is 1090461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1640901 - 2⁵ = 1640869 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273481 + ... + 273486.

It is an arithmetic number, because the mean of its divisors is an integer number (546968).

2^1640901 is an apocalyptic number.

It is an amenable number.

1640901 is a deficient number, since it is larger than the sum of its proper divisors (546971).

1640901 is an equidigital number, since it uses as much as digits as its factorization.

1640901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546970.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1640901 is about 1280.9765805822. The cubic root of 1640901 is about 117.9489628947.

The spelling of 1640901 in words is "one million, six hundred forty thousand, nine hundred one".