997392421 has 4 divisors (see below), whose sum is σ = 997877952. Its totient is φ = 996906892.

The previous prime is 997392379. The next prime is 997392433. The reversal of 997392421 is 124293799.

It is a happy number.

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: 124293799 = 7 ⋅17756257.

It is a cyclic number.

It is not a de Polignac number, because 997392421 - 2¹⁹ = 996868133 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 (997390421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239671 + ... + 243796.

It is an arithmetic number, because the mean of its divisors is an integer number (249469488).

Almost surely, 2^997392421 is an apocalyptic number.

It is an amenable number.

997392421 is a deficient number, since it is larger than the sum of its proper divisors (485531).

997392421 is a wasteful number, since it uses less digits than its factorization.

997392421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485530.

The product of its digits is 244944, while the sum is 46.

The square root of 997392421 is about 31581.5202452320. The cubic root of 997392421 is about 999.1300504072.

The spelling of 997392421 in words is "nine hundred ninety-seven million, three hundred ninety-two thousand, four hundred twenty-one".