997500156 has 48 divisors (see below), whose sum is σ = 2436715008. Its totient is φ = 316993600.

The previous prime is 997500089. The next prime is 997500157. The reversal of 997500156 is 651005799.

It is a super-2 number, since 2×997500156² = 1990013122440048672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997500157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80026 + ... + 91646.

It is an arithmetic number, because the mean of its divisors is an integer number (50764896).

Almost surely, 2^997500156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997500156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1218357504).

997500156 is an abundant number, since it is smaller than the sum of its proper divisors (1439214852).

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

997500156 is a wasteful number, since it uses less digits than its factorization.

997500156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11962 (or 11960 counting only the distinct ones).

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 997500156 is about 31583.2258643730. The cubic root of 997500156 is about 999.1660233430.

The spelling of 997500156 in words is "nine hundred ninety-seven million, five hundred thousand, one hundred fifty-six".