9920401 has 16 divisors (see below), whose sum is σ = 11043648.
Its totient is φ = 8870400.
The previous prime is 9920399. The next prime is 9920411. The reversal of 9920401 is 1040299.
It is a cyclic number.
It is not a de Polignac number, because 9920401 - 21 = 9920399 is a prime.
It is a Duffinian number.
9920401 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (9920411) 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, 29806 + ... + 30136.
It is an arithmetic number, because the mean of its divisors is an integer number (690228).
It is a Poulet number, since it divides 29920400-1.
Almost surely, 29920401 is an apocalyptic number.
It is an amenable number.
9920401 is a deficient number, since it is larger than the sum of its proper divisors (1123247).
9920401 is a wasteful number, since it uses less digits than its factorization.
9920401 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 432.
The product of its (nonzero) digits is 648, while the sum is 25.
The square root of 9920401 is about 3149.6668077751.
Note that the first 3 decimals coincide.
The cubic root of 9920401 is about 214.8703093817.
The spelling of 9920401 in words is "nine million, nine hundred twenty thousand, four hundred one".