997043240 has 32 divisors (see below), whose sum is σ = 2361420000. Its totient is φ = 377826624.

The previous prime is 997043233. The next prime is 997043249. The reversal of 997043240 is 42340799.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 997043194 and 997043203.

It is not an unprimeable number, because it can be changed into a prime (997043249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655190 + ... + 656709.

It is an arithmetic number, because the mean of its divisors is an integer number (73794375).

Almost surely, 2^997043240 is an apocalyptic number.

It is an amenable number.

997043240 is an abundant number, since it is smaller than the sum of its proper divisors (1364376760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997043240 is a wasteful number, since it uses less digits than its factorization.

997043240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311929 (or 1311925 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 997043240 is about 31575.9915125400. The cubic root of 997043240 is about 999.0134403535.

The spelling of 997043240 in words is "nine hundred ninety-seven million, forty-three thousand, two hundred forty".