9901945 has 8 divisors (see below), whose sum is σ = 12507840. Its totient is φ = 7504560.

The previous prime is 9901901. The next prime is 9901981. The reversal of 9901945 is 5491099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9901945 - 2⁹ = 9901433 is a prime.

9901945 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52021 + ... + 52210.

It is an arithmetic number, because the mean of its divisors is an integer number (1563480).

Almost surely, 2^9901945 is an apocalyptic number.

9901945 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9901945 is a deficient number, since it is larger than the sum of its proper divisors (2605895).

9901945 is a wasteful number, since it uses less digits than its factorization.

9901945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104255.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 9901945 is about 3146.7356101204. The cubic root of 9901945 is about 214.7369778018.

The spelling of 9901945 in words is "nine million, nine hundred one thousand, nine hundred forty-five".