997443242 has 4 divisors (see below), whose sum is σ = 1496164866. Its totient is φ = 498721620.

The previous prime is 997443241. The next prime is 997443253. The reversal of 997443242 is 242344799.

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

It can be written as a sum of positive squares in only one way, i.e., 542004961 + 455438281 = 23281^2 + 21341^2 .

It is a super-2 number, since 2×997443242² = 1989786042022941128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 997443193 and 997443202.

It is not an unprimeable number, because it can be changed into a prime (997443241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249360809 + ... + 249360812.

Almost surely, 2^997443242 is an apocalyptic number.

997443242 is a deficient number, since it is larger than the sum of its proper divisors (498721624).

997443242 is a wasteful number, since it uses less digits than its factorization.

997443242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498721623.

The product of its digits is 435456, while the sum is 44.

The square root of 997443242 is about 31582.3248352619. The cubic root of 997443242 is about 999.1470199653.

The spelling of 997443242 in words is "nine hundred ninety-seven million, four hundred forty-three thousand, two hundred forty-two".