1687172426 has 16 divisors (see below), whose sum is σ = 2617005024. Its totient is φ = 815312784.

The previous prime is 1687172407. The next prime is 1687172441. The reversal of 1687172426 is 6242717861.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111680 + ... + 125883.

It is an arithmetic number, because the mean of its divisors is an integer number (163562814).

Almost surely, 2^1687172426 is an apocalyptic number.

1687172426 is a deficient number, since it is larger than the sum of its proper divisors (929832598).

1687172426 is a wasteful number, since it uses less digits than its factorization.

1687172426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237685.

The product of its digits is 225792, while the sum is 44.

The square root of 1687172426 is about 41075.2045156199. The cubic root of 1687172426 is about 1190.4737482410.

The spelling of 1687172426 in words is "one billion, six hundred eighty-seven million, one hundred seventy-two thousand, four hundred twenty-six".