1687213942 has 4 divisors (see below), whose sum is σ = 2530820916. Its totient is φ = 843606970.

The previous prime is 1687213937. The next prime is 1687213951. The reversal of 1687213942 is 2493127861.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421803484 + ... + 421803487.

It is an arithmetic number, because the mean of its divisors is an integer number (632705229).

Almost surely, 2^1687213942 is an apocalyptic number.

1687213942 is a deficient number, since it is larger than the sum of its proper divisors (843606974).

1687213942 is an equidigital number, since it uses as much as digits as its factorization.

1687213942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843606973.

The product of its digits is 145152, while the sum is 43.

The square root of 1687213942 is about 41075.7098782237. The cubic root of 1687213942 is about 1190.4835127642.

The spelling of 1687213942 in words is "one billion, six hundred eighty-seven million, two hundred thirteen thousand, nine hundred forty-two".