1620838 has 4 divisors (see below), whose sum is σ = 2431260. Its totient is φ = 810418.

The previous prime is 1620823. The next prime is 1620841. The reversal of 1620838 is 8380261.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405208 + ... + 405211.

It is an arithmetic number, because the mean of its divisors is an integer number (607815).

2^1620838 is an apocalyptic number.

1620838 is a deficient number, since it is larger than the sum of its proper divisors (810422).

1620838 is an equidigital number, since it uses as much as digits as its factorization.

1620838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810421.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1620838 is about 1273.1213610650. The cubic root of 1620838 is about 117.4662767262.

The spelling of 1620838 in words is "one million, six hundred twenty thousand, eight hundred thirty-eight".