1620345 has 8 divisors (see below), whose sum is σ = 2592576. Its totient is φ = 864176.

The previous prime is 1620337. The next prime is 1620347. The reversal of 1620345 is 5430261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1620345 - 2³ = 1620337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53997 + ... + 54026.

It is an arithmetic number, because the mean of its divisors is an integer number (324072).

2^1620345 is an apocalyptic number.

1620345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620345 is a deficient number, since it is larger than the sum of its proper divisors (972231).

1620345 is a wasteful number, since it uses less digits than its factorization.

1620345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108031.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1620345 is about 1272.9277277206. The cubic root of 1620345 is about 117.4543658614.

The spelling of 1620345 in words is "one million, six hundred twenty thousand, three hundred forty-five".