1897421743 has 8 divisors (see below), whose sum is σ = 2238433280. Its totient is φ = 1573898040.

The previous prime is 1897421723. The next prime is 1897421761. The reversal of 1897421743 is 3471247981.

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

It is a cyclic number.

It is not a de Polignac number, because 1897421743 - 2⁵ = 1897421711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1897421693 and 1897421702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897421723) 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 7 ways as a sum of consecutive naturals, for example, 4371723 + ... + 4372156.

It is an arithmetic number, because the mean of its divisors is an integer number (279804160).

Almost surely, 2^1897421743 is an apocalyptic number.

1897421743 is a deficient number, since it is larger than the sum of its proper divisors (341011537).

1897421743 is an equidigital number, since it uses as much as digits as its factorization.

1897421743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8743917.

The product of its digits is 338688, while the sum is 46.

The square root of 1897421743 is about 43559.4047594776. The cubic root of 1897421743 is about 1238.0018423473.

The spelling of 1897421743 in words is "one billion, eight hundred ninety-seven million, four hundred twenty-one thousand, seven hundred forty-three".