1671443540 has 48 divisors (see below), whose sum is σ = 3867967488. Its totient is φ = 602792064.

The previous prime is 1671443539. The next prime is 1671443561. The reversal of 1671443540 is 453441761.

It is a self number, because there is not a number n which added to its sum of digits gives 1671443540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63572 + ... + 85931.

It is an arithmetic number, because the mean of its divisors is an integer number (80582656).

Almost surely, 2^1671443540 is an apocalyptic number.

1671443540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671443540 is an abundant number, since it is smaller than the sum of its proper divisors (2196523948).

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

1671443540 is a wasteful number, since it uses less digits than its factorization.

1671443540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149568 (or 149566 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 1671443540 is about 40883.2916972203. The cubic root of 1671443540 is about 1186.7627429611.

The spelling of 1671443540 in words is "one billion, six hundred seventy-one million, four hundred forty-three thousand, five hundred forty".