1690743723 has 4 divisors (see below), whose sum is σ = 2254324968. Its totient is φ = 1127162480.

The previous prime is 1690743673. The next prime is 1690743757. The reversal of 1690743723 is 3273470961.

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

It is a cyclic number.

It is not a de Polignac number, because 1690743723 - 2¹⁰ = 1690742699 is a prime.

It is a super-2 number, since 2×1690743723² = 5717228673727801458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1690743023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281790618 + ... + 281790623.

It is an arithmetic number, because the mean of its divisors is an integer number (563581242).

Almost surely, 2^1690743723 is an apocalyptic number.

1690743723 is a deficient number, since it is larger than the sum of its proper divisors (563581245).

1690743723 is an equidigital number, since it uses as much as digits as its factorization.

1690743723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563581244.

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 1690743723 is about 41118.6541973348. The cubic root of 1690743723 is about 1191.3131287713.

The spelling of 1690743723 in words is "one billion, six hundred ninety million, seven hundred forty-three thousand, seven hundred twenty-three".