1621189696 has 63 divisors (see below), whose sum is σ = 3747492759. Its totient is φ = 693829248.

The previous prime is 1621189663. The next prime is 1621189709. The reversal of 1621189696 is 6969811261.

The square root of 1621189696 is 40264.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2254425 + ... + 2255143.

Almost surely, 2^1621189696 is an apocalyptic number.

1621189696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1621189696 is the 40264-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621189696

1621189696 is an abundant number, since it is smaller than the sum of its proper divisors (2126303063).

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

1621189696 is an frugal number, since it uses more digits than its factorization.

1621189696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 728 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

The cubic root of 1621189696 is about 1174.7477221477.

Multiplying 1621189696 by its sum of digits (49), we get a square (79438295104 = 281848²).

1621189696 divided by its sum of digits (49) gives a square (33085504 = 5752²).

The spelling of 1621189696 in words is "one billion, six hundred twenty-one million, one hundred eighty-nine thousand, six hundred ninety-six".