997994446 has 4 divisors (see below), whose sum is σ = 1496991672. Its totient is φ = 498997222.

The previous prime is 997994443. The next prime is 997994519. The reversal of 997994446 is 644499799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 644499799 = 29 ⋅22224131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997994441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249498610 + ... + 249498613.

It is an arithmetic number, because the mean of its divisors is an integer number (374247918).

Almost surely, 2^997994446 is an apocalyptic number.

997994446 is a deficient number, since it is larger than the sum of its proper divisors (498997226).

997994446 is a wasteful number, since it uses less digits than its factorization.

997994446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498997225.

The product of its digits is 17635968, while the sum is 61.

The square root of 997994446 is about 31591.0500933413. The cubic root of 997994446 is about 999.3310345851.

The spelling of 997994446 in words is "nine hundred ninety-seven million, nine hundred ninety-four thousand, four hundred forty-six".