1621774479 has 16 divisors (see below), whose sum is σ = 2329615232. Its totient is φ = 997623648.

The previous prime is 1621774457. The next prime is 1621774481. The reversal of 1621774479 is 9744771261.

It is a happy number.

It is not a de Polignac number, because 1621774479 - 2⁵ = 1621774447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621774439) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 116784 + ... + 129930.

It is an arithmetic number, because the mean of its divisors is an integer number (145600952).

Almost surely, 2^1621774479 is an apocalyptic number.

1621774479 is a deficient number, since it is larger than the sum of its proper divisors (707840753).

1621774479 is a wasteful number, since it uses less digits than its factorization.

1621774479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16326.

The product of its digits is 592704, while the sum is 48.

The square root of 1621774479 is about 40271.2612044868. The cubic root of 1621774479 is about 1174.8889538032. Note that the first 3 decimals are identical.

The spelling of 1621774479 in words is "one billion, six hundred twenty-one million, seven hundred seventy-four thousand, four hundred seventy-nine".