1621049814 has 24 divisors (see below), whose sum is σ = 3602990520. Its totient is φ = 540251316.

The previous prime is 1621049813. The next prime is 1621049863. The reversal of 1621049814 is 4189401261.

1621049814 is a `hidden beast` number, since 162 + 1 + 0 + 498 + 1 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621049813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 293127 + ... + 298605.

It is an arithmetic number, because the mean of its divisors is an integer number (150124605).

Almost surely, 2^1621049814 is an apocalyptic number.

1621049814 is an abundant number, since it is smaller than the sum of its proper divisors (1981940706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621049814 is an frugal number, since it uses more digits than its factorization.

1621049814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10969 (or 5484 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1621049814 is about 40262.2629021271. The cubic root of 1621049814 is about 1174.7139340418.

Multiplying 1621049814 by its product of nonzero digits (13824), we get a square (22409392628736 = 4733856²).

The spelling of 1621049814 in words is "one billion, six hundred twenty-one million, forty-nine thousand, eight hundred fourteen".