1621674844 has 24 divisors (see below), whose sum is σ = 2868521040. Its totient is φ = 802144896.

The previous prime is 1621674841. The next prime is 1621674851. The reversal of 1621674844 is 4484761261.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621674844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621674841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135304 + ... + 146800.

It is an arithmetic number, because the mean of its divisors is an integer number (119521710).

Almost surely, 2^1621674844 is an apocalyptic number.

It is an amenable number.

1621674844 is a deficient number, since it is larger than the sum of its proper divisors (1246846196).

1621674844 is a wasteful number, since it uses less digits than its factorization.

1621674844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11877 (or 11875 counting only the distinct ones).

The product of its digits is 258048, while the sum is 43.

The square root of 1621674844 is about 40270.0241370675. The cubic root of 1621674844 is about 1174.8648932326.

The spelling of 1621674844 in words is "one billion, six hundred twenty-one million, six hundred seventy-four thousand, eight hundred forty-four".