1621994 has 8 divisors (see below), whose sum is σ = 2654208. Its totient is φ = 737260.

The previous prime is 1621993. The next prime is 1622009. The reversal of 1621994 is 4991261.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1621994.

It is not an unprimeable number, because it can be changed into a prime (1621993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36842 + ... + 36885.

It is an arithmetic number, because the mean of its divisors is an integer number (331776).

2^1621994 is an apocalyptic number.

1621994 is a deficient number, since it is larger than the sum of its proper divisors (1032214).

1621994 is a wasteful number, since it uses less digits than its factorization.

1621994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73740.

The product of its digits is 3888, while the sum is 32.

The square root of 1621994 is about 1273.5752824235. The cubic root of 1621994 is about 117.4941961823.

The spelling of 1621994 in words is "one million, six hundred twenty-one thousand, nine hundred ninety-four".