997485890 has 8 divisors (see below), whose sum is σ = 1795474620. Its totient is φ = 398994352.

The previous prime is 997485871. The next prime is 997485899. The reversal of 997485890 is 98584799.

It is a Cunningham number, because it is equal to 31583²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 997485889 + 1 = 31583^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (997485899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49874285 + ... + 49874304.

Almost surely, 2^997485890 is an apocalyptic number.

997485890 is a deficient number, since it is larger than the sum of its proper divisors (797988730).

997485890 is a wasteful number, since it uses less digits than its factorization.

997485890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99748596.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 997485890 is about 31583.0000158313. Note that the first 4 decimals coincide. The cubic root of 997485890 is about 999.1612600453.

The spelling of 997485890 in words is "nine hundred ninety-seven million, four hundred eighty-five thousand, eight hundred ninety".