1620874 has 4 divisors (see below), whose sum is σ = 2431314. Its totient is φ = 810436.

The previous prime is 1620841. The next prime is 1620881. The reversal of 1620874 is 4780261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1456849 + 164025 = 1207^2 + 405^2 .

It is an Ulam number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 405217 + ... + 405220.

2^1620874 is an apocalyptic number.

1620874 is a deficient number, since it is larger than the sum of its proper divisors (810440).

1620874 is an equidigital number, since it uses as much as digits as its factorization.

1620874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810439.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1620874 is about 1273.1354994658. The cubic root of 1620874 is about 117.4671463905.

The spelling of 1620874 in words is "one million, six hundred twenty thousand, eight hundred seventy-four".