1645031982 has 32 divisors (see below), whose sum is σ = 3650002560. Its totient is φ = 490044320.

The previous prime is 1645031977. The next prime is 1645031987. The reversal of 1645031982 is 2891305461.

It is an interprime number because it is at equal distance from previous prime (1645031977) and next prime (1645031987).

It is a super-2 number, since 2×1645031982² = 5412260443605696648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1645031982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645031987) 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 15 ways as a sum of consecutive naturals, for example, 207333 + ... + 215120.

It is an arithmetic number, because the mean of its divisors is an integer number (114062580).

Almost surely, 2^1645031982 is an apocalyptic number.

1645031982 is an abundant number, since it is smaller than the sum of its proper divisors (2004970578).

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

1645031982 is a wasteful number, since it uses less digits than its factorization.

1645031982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422528.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1645031982 is about 40558.9938484672. The cubic root of 1645031982 is about 1180.4785911747.

The spelling of 1645031982 in words is "one billion, six hundred forty-five million, thirty-one thousand, nine hundred eighty-two".