1620671 has 8 divisors (see below), whose sum is σ = 1775760. Its totient is φ = 1469952.

The previous prime is 1620667. The next prime is 1620677. The reversal of 1620671 is 1760261.

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 1620671 - 2² = 1620667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620677) 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, 290 + ... + 1823.

It is an arithmetic number, because the mean of its divisors is an integer number (221970).

2^1620671 is an apocalyptic number.

1620671 is a deficient number, since it is larger than the sum of its proper divisors (155089).

1620671 is a wasteful number, since it uses less digits than its factorization.

1620671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1620671 is about 1273.0557725410. The cubic root of 1620671 is about 117.4622422819.

The spelling of 1620671 in words is "one million, six hundred twenty thousand, six hundred seventy-one".