1684523157 has 8 divisors (see below), whose sum is σ = 2249073120. Its totient is φ = 1121494320.

The previous prime is 1684523131. The next prime is 1684523173. The reversal of 1684523157 is 7513254861.

It is a happy number.

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

It is not a de Polignac number, because 1684523157 - 2⁸ = 1684522901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604523157) 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, 377694 + ... + 382127.

It is an arithmetic number, because the mean of its divisors is an integer number (281134140).

Almost surely, 2^1684523157 is an apocalyptic number.

It is an amenable number.

1684523157 is a deficient number, since it is larger than the sum of its proper divisors (564549963).

1684523157 is an equidigital number, since it uses as much as digits as its factorization.

1684523157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760563.

The product of its digits is 201600, while the sum is 42.

The square root of 1684523157 is about 41042.9428403958. The cubic root of 1684523157 is about 1189.8503111860.

The spelling of 1684523157 in words is "one billion, six hundred eighty-four million, five hundred twenty-three thousand, one hundred fifty-seven".