1620773 has 24 divisors (see below), whose sum is σ = 2145024. Its totient is φ = 1209600.

The previous prime is 1620769. The next prime is 1620803. The reversal of 1620773 is 3770261.

It is not a de Polignac number, because 1620773 - 2² = 1620769 is a prime.

It is a Curzon number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16661 + ... + 16757.

It is an arithmetic number, because the mean of its divisors is an integer number (89376).

2^1620773 is an apocalyptic number.

It is an amenable number.

1620773 is a deficient number, since it is larger than the sum of its proper divisors (524251).

1620773 is a wasteful number, since it uses less digits than its factorization.

1620773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 1620773 is about 1273.0958329992. The cubic root of 1620773 is about 117.4647064665.

The spelling of 1620773 in words is "one million, six hundred twenty thousand, seven hundred seventy-three".