1968297421 has 4 divisors (see below), whose sum is σ = 1986692832. Its totient is φ = 1949902012.

The previous prime is 1968297413. The next prime is 1968297439. The reversal of 1968297421 is 1247928691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1968297421 - 2³ = 1968297413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968297481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9197545 + ... + 9197758.

It is an arithmetic number, because the mean of its divisors is an integer number (496673208).

Almost surely, 2^1968297421 is an apocalyptic number.

It is an amenable number.

1968297421 is a deficient number, since it is larger than the sum of its proper divisors (18395411).

1968297421 is a wasteful number, since it uses less digits than its factorization.

1968297421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395410.

The product of its digits is 435456, while the sum is 49.

The square root of 1968297421 is about 44365.4980925493. The cubic root of 1968297421 is about 1253.2284377200.

The spelling of 1968297421 in words is "one billion, nine hundred sixty-eight million, two hundred ninety-seven thousand, four hundred twenty-one".