1620918 has 32 divisors (see below), whose sum is σ = 3880800. Its totient is φ = 498528.

The previous prime is 1620917. The next prime is 1620923. The reversal of 1620918 is 8190261.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1620891 and 1620900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620917) 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 15 ways as a sum of consecutive naturals, for example, 453 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (121275).

2^1620918 is an apocalyptic number.

1620918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1620918 is an abundant number, since it is smaller than the sum of its proper divisors (2259882).

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

1620918 is a wasteful number, since it uses less digits than its factorization.

1620918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333 (or 2327 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1620918 is about 1273.1527795202. The cubic root of 1620918 is about 117.4682092960.

The spelling of 1620918 in words is "one million, six hundred twenty thousand, nine hundred eighteen".