1640361 has 8 divisors (see below), whose sum is σ = 2220064. Its totient is φ = 1077120.

The previous prime is 1640333. The next prime is 1640393. The reversal of 1640361 is 1630461.

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

It is not a de Polignac number, because 1640361 - 2⁹ = 1639849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640311) 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, 3880 + ... + 4281.

It is an arithmetic number, because the mean of its divisors is an integer number (277508).

2^1640361 is an apocalyptic number.

It is an amenable number.

1640361 is a deficient number, since it is larger than the sum of its proper divisors (579703).

1640361 is an equidigital number, since it uses as much as digits as its factorization.

1640361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8231.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1640361 is about 1280.7657865512. The cubic root of 1640361 is about 117.9360229656.

The spelling of 1640361 in words is "one million, six hundred forty thousand, three hundred sixty-one".