1620830 has 16 divisors (see below), whose sum is σ = 2946240. Its totient is φ = 641952.

The previous prime is 1620823. The next prime is 1620841. The reversal of 1620830 is 380261.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 347 + ... + 1833.

It is an arithmetic number, because the mean of its divisors is an integer number (184140).

2^1620830 is an apocalyptic number.

1620830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620830 is a deficient number, since it is larger than the sum of its proper divisors (1325410).

1620830 is a wasteful number, since it uses less digits than its factorization.

1620830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1620830 is about 1273.1182191768. The cubic root of 1620830 is about 117.4660834658.

The spelling of 1620830 in words is "one million, six hundred twenty thousand, eight hundred thirty".