99401940 has 144 divisors (see below), whose sum is σ = 334728576. Its totient is φ = 23673600.

The previous prime is 99401899. The next prime is 99401947. The reversal of 99401940 is 4910499.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 99401895 and 99401904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99401947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120369 + ... + 121191.

It is an arithmetic number, because the mean of its divisors is an integer number (2324504).

Almost surely, 2^99401940 is an apocalyptic number.

99401940 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99401940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167364288).

99401940 is an abundant number, since it is smaller than the sum of its proper divisors (235326636).

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

99401940 is a wasteful number, since it uses less digits than its factorization.

99401940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 905 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 99401940 is about 9970.0521563330. The cubic root of 99401940 is about 463.2317163531.

The spelling of 99401940 in words is "ninety-nine million, four hundred one thousand, nine hundred forty".