1621808086 has 8 divisors (see below), whose sum is σ = 2443621824. Its totient is φ = 807267480.

The previous prime is 1621808053. The next prime is 1621808113. The reversal of 1621808086 is 6808081261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1621808086² = 5260522935629966792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1817725 + ... + 1818616.

It is an arithmetic number, because the mean of its divisors is an integer number (305452728).

Almost surely, 2^1621808086 is an apocalyptic number.

1621808086 is a deficient number, since it is larger than the sum of its proper divisors (821813738).

1621808086 is a wasteful number, since it uses less digits than its factorization.

1621808086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636566.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 1621808086 is about 40271.6784601784. The cubic root of 1621808086 is about 1174.8970692391.

The spelling of 1621808086 in words is "one billion, six hundred twenty-one million, eight hundred eight thousand, eighty-six".