1640627 has 4 divisors (see below), whose sum is σ = 1643280. Its totient is φ = 1637976.

The previous prime is 1640623. The next prime is 1640633. The reversal of 1640627 is 7260461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7260461 = 13 ⋅558497.

It is a cyclic number.

It is not a de Polignac number, because 1640627 - 2² = 1640623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640596 and 1640605.

It is not an unprimeable number, because it can be changed into a prime (1640621) 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, 149 + ... + 1817.

It is an arithmetic number, because the mean of its divisors is an integer number (410820).

2^1640627 is an apocalyptic number.

1640627 is a deficient number, since it is larger than the sum of its proper divisors (2653).

1640627 is an equidigital number, since it uses as much as digits as its factorization.

1640627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1640627 is about 1280.8696264648. The cubic root of 1640627 is about 117.9423974337.

The spelling of 1640627 in words is "one million, six hundred forty thousand, six hundred twenty-seven".