1620379 has 2 divisors, whose sum is σ = 1620380. Its totient is φ = 1620378.

The previous prime is 1620371. The next prime is 1620391. The reversal of 1620379 is 9730261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620379 - 2³ = 1620371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810189 + 810190.

It is an arithmetic number, because the mean of its divisors is an integer number (810190).

2^1620379 is an apocalyptic number.

1620379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620379 is an equidigital number, since it uses as much as digits as its factorization.

1620379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 1620379 is about 1272.9410826900. The cubic root of 1620379 is about 117.4551873779.

The spelling of 1620379 in words is "one million, six hundred twenty thousand, three hundred seventy-nine".