99997240 has 96 divisors (see below), whose sum is σ = 264174480. Its totient is φ = 33965568.

The previous prime is 99997189. The next prime is 99997243. The reversal of 99997240 is 4279999.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 319324 + ... + 319636.

Almost surely, 2^99997240 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 99997240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132087240).

99997240 is an abundant number, since it is smaller than the sum of its proper divisors (164177240).

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

99997240 is a wasteful number, since it uses less digits than its factorization.

99997240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 99997240 is about 9999.8619990478. The cubic root of 99997240 is about 464.1546130603.

The spelling of 99997240 in words is "ninety-nine million, nine hundred ninety-seven thousand, two hundred forty".