1646452840 has 16 divisors (see below), whose sum is σ = 3704518980. Its totient is φ = 658581120.

The previous prime is 1646452807. The next prime is 1646452853. The reversal of 1646452840 is 482546461.

It can be written as a sum of positive squares in 2 ways, for example, as 1345569124 + 300883716 = 36682^2 + 17346^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 41161321 = 1646452840 / (1 + 6 + 4 + 6 + 4 + 5 + 2 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1646452793 and 1646452802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20580621 + ... + 20580700.

Almost surely, 2^1646452840 is an apocalyptic number.

1646452840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646452840 is an abundant number, since it is smaller than the sum of its proper divisors (2058066140).

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

1646452840 is a wasteful number, since it uses less digits than its factorization.

1646452840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41161332 (or 41161328 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The square root of 1646452840 is about 40576.5060102518. The cubic root of 1646452840 is about 1180.8183636518.

The spelling of 1646452840 in words is "one billion, six hundred forty-six million, four hundred fifty-two thousand, eight hundred forty".