1687630939 has 8 divisors (see below), whose sum is σ = 1824466640. Its totient is φ = 1555596576.

The previous prime is 1687630937. The next prime is 1687630951. The reversal of 1687630939 is 9390367861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1687630939 - 2¹ = 1687630937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1687630937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1199604 + ... + 1201009.

It is an arithmetic number, because the mean of its divisors is an integer number (228058330).

Almost surely, 2^1687630939 is an apocalyptic number.

1687630939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1687630939 is a deficient number, since it is larger than the sum of its proper divisors (136835701).

1687630939 is a wasteful number, since it uses less digits than its factorization.

1687630939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400669.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 1687630939 is about 41080.7855207273. The cubic root of 1687630939 is about 1190.5815811733.

The spelling of 1687630939 in words is "one billion, six hundred eighty-seven million, six hundred thirty thousand, nine hundred thirty-nine".