1687009394 has 16 divisors (see below), whose sum is σ = 2898614400. Its totient is φ = 721354464.

The previous prime is 1687009391. The next prime is 1687009397. The reversal of 1687009394 is 4939007861.

It is an interprime number because it is at equal distance from previous prime (1687009391) and next prime (1687009397).

It is not an unprimeable number, because it can be changed into a prime (1687009391) 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, 131099 + ... + 143390.

It is an arithmetic number, because the mean of its divisors is an integer number (181163400).

Almost surely, 2^1687009394 is an apocalyptic number.

1687009394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1687009394 is a deficient number, since it is larger than the sum of its proper divisors (1211605006).

1687009394 is a wasteful number, since it uses less digits than its factorization.

1687009394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274937.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1687009394 is about 41073.2199127363. The cubic root of 1687009394 is about 1190.4354017221.

The spelling of 1687009394 in words is "one billion, six hundred eighty-seven million, nine thousand, three hundred ninety-four".