1620871 has 12 divisors (see below), whose sum is σ = 1985880. Its totient is φ = 1315440.

The previous prime is 1620841. The next prime is 1620881. The reversal of 1620871 is 1780261.

It is not a de Polignac number, because 1620871 - 2⁷ = 1620743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (165490).

2^1620871 is an apocalyptic number.

1620871 is a deficient number, since it is larger than the sum of its proper divisors (365009).

1620871 is a wasteful number, since it uses less digits than its factorization.

1620871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1620871 is about 1273.1343212717. The cubic root of 1620871 is about 117.4670739190.

The spelling of 1620871 in words is "one million, six hundred twenty thousand, eight hundred seventy-one".