1687844442 has 32 divisors (see below), whose sum is σ = 3556526400. Its totient is φ = 532528128.

The previous prime is 1687844419. The next prime is 1687844453. The reversal of 1687844442 is 2444487861.

It is a junction number, because it is equal to n+sod(n) for n = 1687844391 and 1687844400.

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, 135034 + ... + 147002.

It is an arithmetic number, because the mean of its divisors is an integer number (111141450).

Almost surely, 2^1687844442 is an apocalyptic number.

1687844442 is an abundant number, since it is smaller than the sum of its proper divisors (1868681958).

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

1687844442 is a wasteful number, since it uses less digits than its factorization.

1687844442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13230.

The product of its digits is 1376256, while the sum is 48.

The square root of 1687844442 is about 41083.3840134914. The cubic root of 1687844442 is about 1190.6317860719.

The spelling of 1687844442 in words is "one billion, six hundred eighty-seven million, eight hundred forty-four thousand, four hundred forty-two".