1620986917 has 8 divisors (see below), whose sum is σ = 1768860000. Its totient is φ = 1473198960.

The previous prime is 1620986903. The next prime is 1620986923. The reversal of 1620986917 is 7196890261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620986917 - 2⁷ = 1620986789 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 (1620986417) 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 7 ways as a sum of consecutive naturals, for example, 22459 + ... + 61207.

It is an arithmetic number, because the mean of its divisors is an integer number (221107500).

Almost surely, 2^1620986917 is an apocalyptic number.

It is an amenable number.

1620986917 is a deficient number, since it is larger than the sum of its proper divisors (147873083).

1620986917 is a wasteful number, since it uses less digits than its factorization.

1620986917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42563.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 1620986917 is about 40261.4818033316. The cubic root of 1620986917 is about 1174.6987408139.

The spelling of 1620986917 in words is "one billion, six hundred twenty million, nine hundred eighty-six thousand, nine hundred seventeen".