1620793 has 6 divisors (see below), whose sum is σ = 1654814. Its totient is φ = 1587456.

The previous prime is 1620769. The next prime is 1620803. The reversal of 1620793 is 3970261.

It can be written as a sum of positive squares in 3 ways, for example, as 1106704 + 514089 = 1052^2 + 717^2 .

It is not a de Polignac number, because 1620793 - 2¹³ = 1612601 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2521 + ... + 3097.

2^1620793 is an apocalyptic number.

It is an amenable number.

1620793 is a deficient number, since it is larger than the sum of its proper divisors (34021).

1620793 is an frugal number, since it uses more digits than its factorization.

1620793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 1620793 is about 1273.1036878432. The cubic root of 1620793 is about 117.4651896278.

The spelling of 1620793 in words is "one million, six hundred twenty thousand, seven hundred ninety-three".