1646396416 has 176 divisors, whose sum is σ = 4067798400. Its totient is φ = 649986048.

The previous prime is 1646396413. The next prime is 1646396429. The reversal of 1646396416 is 6146936461.

It is not an unprimeable number, because it can be changed into a prime (1646396413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7189390 + ... + 7189618.

Almost surely, 2^1646396416 is an apocalyptic number.

1646396416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646396416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2033899200).

1646396416 is an abundant number, since it is smaller than the sum of its proper divisors (2421401984).

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

1646396416 is a wasteful number, since it uses less digits than its factorization.

1646396416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 314 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The square root of 1646396416 is about 40575.8107251106. The cubic root of 1646396416 is about 1180.8048746013.

The spelling of 1646396416 in words is "one billion, six hundred forty-six million, three hundred ninety-six thousand, four hundred sixteen".