997490970 has 128 divisors (see below), whose sum is σ = 3048814080. Its totient is φ = 227335680.

The previous prime is 997490959. The next prime is 997490981. The reversal of 997490970 is 79094799.

It is an interprime number because it is at equal distance from previous prime (997490959) and next prime (997490981).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 984184 + ... + 985196.

It is an arithmetic number, because the mean of its divisors is an integer number (23818860).

Almost surely, 2^997490970 is an apocalyptic number.

997490970 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 997490970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524407040).

997490970 is an abundant number, since it is smaller than the sum of its proper divisors (2051323110).

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

997490970 is a wasteful number, since it uses less digits than its factorization.

997490970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1551 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The square root of 997490970 is about 31583.0804387412. The cubic root of 997490970 is about 999.1629562199.

The spelling of 997490970 in words is "nine hundred ninety-seven million, four hundred ninety thousand, nine hundred seventy".