1621359120 has 40 divisors (see below), whose sum is σ = 5026214016. Its totient is φ = 432362368.

The previous prime is 1621359059. The next prime is 1621359133. The reversal of 1621359120 is 219531261.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3377592 + ... + 3378071.

Almost surely, 2^1621359120 is an apocalyptic number.

1621359120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621359120 is an abundant number, since it is smaller than the sum of its proper divisors (3404854896).

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

1621359120 is a wasteful number, since it uses less digits than its factorization.

1621359120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6755679 (or 6755673 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1621359120 is about 40266.1038592015. The cubic root of 1621359120 is about 1174.7886434386.

The spelling of 1621359120 in words is "one billion, six hundred twenty-one million, three hundred fifty-nine thousand, one hundred twenty".