8401990 has 16 divisors (see below), whose sum is σ = 15919920. Its totient is φ = 3183840.

The previous prime is 8401973. The next prime is 8401993. The reversal of 8401990 is 991048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8401993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21921 + ... + 22300.

It is an arithmetic number, because the mean of its divisors is an integer number (994995).

Almost surely, 2^8401990 is an apocalyptic number.

8401990 is a deficient number, since it is larger than the sum of its proper divisors (7517930).

8401990 is a wasteful number, since it uses less digits than its factorization.

8401990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44247.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 8401990 is about 2898.6186365233. The cubic root of 8401990 is about 203.2953227046.

The spelling of 8401990 in words is "eight million, four hundred one thousand, nine hundred ninety".