997802190 has 288 divisors, whose sum is σ = 3352212864. Its totient is φ = 203575680.

The previous prime is 997802171. The next prime is 997802203. The reversal of 997802190 is 91208799.

It is a super-2 number, since 2×997802190² = 1991218420737592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3250017 + ... + 3250323.

It is an arithmetic number, because the mean of its divisors is an integer number (11639628).

Almost surely, 2^997802190 is an apocalyptic number.

997802190 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 997802190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1676106432).

997802190 is an abundant number, since it is smaller than the sum of its proper divisors (2354410674).

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

997802190 is a wasteful number, since it uses less digits than its factorization.

997802190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 997802190 is about 31588.0070596421. The cubic root of 997802190 is about 999.2668593027.

The spelling of 997802190 in words is "nine hundred ninety-seven million, eight hundred two thousand, one hundred ninety".