1620045 has 48 divisors (see below), whose sum is σ = 3319680. Its totient is φ = 715392.

The previous prime is 1620041. The next prime is 1620071. The reversal of 1620045 is 5400261.

It is a happy number.

1620045 is a `hidden beast` number, since 1 + 620 + 0 + 45 = 666.

It is not a de Polignac number, because 1620045 - 2² = 1620041 is a prime.

1620045 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11586 + ... + 11724.

It is an arithmetic number, because the mean of its divisors is an integer number (69160).

2^1620045 is an apocalyptic number.

1620045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620045 is an abundant number, since it is smaller than the sum of its proper divisors (1699635).

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

1620045 is a wasteful number, since it uses less digits than its factorization.

1620045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1620045 is about 1272.8098836826. The cubic root of 1620045 is about 117.4471166882.

It can be divided in two parts, 16200 and 45, that multiplied together give a cube (729000 = 90³).

The spelling of 1620045 in words is "one million, six hundred twenty thousand, forty-five".