1671997540 has 48 divisors (see below), whose sum is σ = 3562574400. Its totient is φ = 659085440.

The previous prime is 1671997513. The next prime is 1671997541. The reversal of 1671997540 is 457991761.

It is not an unprimeable number, because it can be changed into a prime (1671997541) 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, 388239 + ... + 392521.

It is an arithmetic number, because the mean of its divisors is an integer number (74220300).

Almost surely, 2^1671997540 is an apocalyptic number.

1671997540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671997540 is an abundant number, since it is smaller than the sum of its proper divisors (1890576860).

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

1671997540 is a wasteful number, since it uses less digits than its factorization.

1671997540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572 (or 4570 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 49.

The square root of 1671997540 is about 40890.0665198774. The cubic root of 1671997540 is about 1186.8938459903.

The spelling of 1671997540 in words is "one billion, six hundred seventy-one million, nine hundred ninety-seven thousand, five hundred forty".