1687212040 has 64 divisors (see below), whose sum is σ = 3846268800. Its totient is φ = 666043392.

The previous prime is 1687212031. The next prime is 1687212041. The reversal of 1687212040 is 402127861.

It is a junction number, because it is equal to n+sod(n) for n = 1687211993 and 1687212011.

It is not an unprimeable number, because it can be changed into a prime (1687212041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1278501 + ... + 1279819.

It is an arithmetic number, because the mean of its divisors is an integer number (60097950).

Almost surely, 2^1687212040 is an apocalyptic number.

1687212040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1687212040 is an abundant number, since it is smaller than the sum of its proper divisors (2159056760).

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

1687212040 is a wasteful number, since it uses less digits than its factorization.

1687212040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726 (or 1722 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1687212040 is about 41075.6867258479. The cubic root of 1687212040 is about 1190.4830654191.

The spelling of 1687212040 in words is "one billion, six hundred eighty-seven million, two hundred twelve thousand, forty".