1630634440 has 16 divisors (see below), whose sum is σ = 3668927580. Its totient is φ = 652253760.

The previous prime is 1630634431. The next prime is 1630634449. The reversal of 1630634440 is 444360361.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1630634431) and next prime (1630634449).

It can be written as a sum of positive squares in 2 ways, for example, as 1630059876 + 574564 = 40374^2 + 758^2 .

It is a super-2 number, since 2×1630634440² = 5317937353828227200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1630634449) by changing a digit.

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, 20382891 + ... + 20382970.

Almost surely, 2^1630634440 is an apocalyptic number.

1630634440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1630634440 is an abundant number, since it is smaller than the sum of its proper divisors (2038293140).

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

1630634440 is a wasteful number, since it uses less digits than its factorization.

1630634440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40765872 (or 40765868 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 1630634440 is about 40381.1148929794. The cubic root of 1630634440 is about 1177.0245922002.

The spelling of 1630634440 in words is "one billion, six hundred thirty million, six hundred thirty-four thousand, four hundred forty".