1620867 has 8 divisors (see below), whose sum is σ = 2168080. Its totient is φ = 1077120.

The previous prime is 1620841. The next prime is 1620881. The reversal of 1620867 is 7680261.

It is a happy number.

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

It is not a de Polignac number, because 1620867 - 2⁶ = 1620803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620887) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 567 + ... + 1887.

It is an arithmetic number, because the mean of its divisors is an integer number (271010).

2^1620867 is an apocalyptic number.

1620867 is a deficient number, since it is larger than the sum of its proper divisors (547213).

1620867 is a wasteful number, since it uses less digits than its factorization.

1620867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1620867 is about 1273.1327503446. The cubic root of 1620867 is about 117.4669772901.

The spelling of 1620867 in words is "one million, six hundred twenty thousand, eight hundred sixty-seven".