1646090385 has 8 divisors (see below), whose sum is σ = 2633744640. Its totient is φ = 877914864.

The previous prime is 1646090363. The next prime is 1646090387. The reversal of 1646090385 is 5830906461.

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

It is not a de Polignac number, because 1646090385 - 2⁸ = 1646090129 is a prime.

It is a super-2 number, since 2×1646090385² = 5419227111178896450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1646090387) 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, 54869665 + ... + 54869694.

It is an arithmetic number, because the mean of its divisors is an integer number (329218080).

Almost surely, 2^1646090385 is an apocalyptic number.

1646090385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1646090385 is a deficient number, since it is larger than the sum of its proper divisors (987654255).

1646090385 is a wasteful number, since it uses less digits than its factorization.

1646090385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109739367.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1646090385 is about 40572.0394483689. The cubic root of 1646090385 is about 1180.7317076764.

The spelling of 1646090385 in words is "one billion, six hundred forty-six million, ninety thousand, three hundred eighty-five".