1967937421 has 4 divisors (see below), whose sum is σ = 1968232672. Its totient is φ = 1967642172.

The previous prime is 1967937379. The next prime is 1967937427. The reversal of 1967937421 is 1247397691.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1247397691 = 263 ⋅4742957.

It is a cyclic number.

It is not a de Polignac number, because 1967937421 - 2⁹ = 1967936909 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 (1967937427) 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, 137391 + ... + 151036.

It is an arithmetic number, because the mean of its divisors is an integer number (492058168).

Almost surely, 2^1967937421 is an apocalyptic number.

It is an amenable number.

1967937421 is a deficient number, since it is larger than the sum of its proper divisors (295251).

1967937421 is an equidigital number, since it uses as much as digits as its factorization.

1967937421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295250.

The product of its digits is 571536, while the sum is 49.

The square root of 1967937421 is about 44361.4407002297. The cubic root of 1967937421 is about 1253.1520282402.

The spelling of 1967937421 in words is "one billion, nine hundred sixty-seven million, nine hundred thirty-seven thousand, four hundred twenty-one".