997421250 has 80 divisors (see below), whose sum is σ = 2848938048. Its totient is φ = 227976000.

The previous prime is 997421231. The next prime is 997421251. The reversal of 997421250 is 52124799.

It is a junction number, because it is equal to n+sod(n) for n = 997421199 and 997421208.

It is not an unprimeable number, because it can be changed into a prime (997421251) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7252 + ... + 45248.

Almost surely, 2^997421250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997421250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1424469024).

997421250 is an abundant number, since it is smaller than the sum of its proper divisors (1851516798).

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

997421250 is a wasteful number, since it uses less digits than its factorization.

997421250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38029 (or 38014 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 997421250 is about 31581.9766639139. The cubic root of 997421250 is about 999.1396767228.

The spelling of 997421250 in words is "nine hundred ninety-seven million, four hundred twenty-one thousand, two hundred fifty".