1620799 has 4 divisors (see below), whose sum is σ = 1658536. Its totient is φ = 1583064.

The previous prime is 1620769. The next prime is 1620803. The reversal of 1620799 is 9970261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9970261 = 7 ⋅1424323.

It is a cyclic number.

It is not a de Polignac number, because 1620799 - 2¹⁵ = 1588031 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 (1620739) 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, 18804 + ... + 18889.

It is an arithmetic number, because the mean of its divisors is an integer number (414634).

2^1620799 is an apocalyptic number.

1620799 is a deficient number, since it is larger than the sum of its proper divisors (37737).

1620799 is an equidigital number, since it uses as much as digits as its factorization.

1620799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37736.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 1620799 is about 1273.1060442870. The cubic root of 1620799 is about 117.4653345754.

The spelling of 1620799 in words is "one million, six hundred twenty thousand, seven hundred ninety-nine".