1620924 has 12 divisors (see below), whose sum is σ = 3782184. Its totient is φ = 540304.

The previous prime is 1620923. The next prime is 1620929. The reversal of 1620924 is 4290261.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1620924² = 5254789227552, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1620894 and 1620903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67527 + ... + 67550.

It is an arithmetic number, because the mean of its divisors is an integer number (315182).

2^1620924 is an apocalyptic number.

It is an amenable number.

1620924 is an abundant number, since it is smaller than the sum of its proper divisors (2161260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620924 is a wasteful number, since it uses less digits than its factorization.

1620924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135084 (or 135082 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1620924 is about 1273.1551358731. The cubic root of 1620924 is about 117.4683542362.

Subtracting from 1620924 its sum of digits (24), we obtain a triangular number (1620900 = T₁₈₀₀).

The spelling of 1620924 in words is "one million, six hundred twenty thousand, nine hundred twenty-four".