10391890 has 16 divisors (see below), whose sum is σ = 18892440. Its totient is φ = 4115200.

The previous prime is 10391873. The next prime is 10391893. The reversal of 10391890 is 9819301.

It can be written as a sum of positive squares in 4 ways, for example, as 10361961 + 29929 = 3219^2 + 173^2 .

It is not an unprimeable number, because it can be changed into a prime (10391893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4135 + ... + 6154.

Almost surely, 2^10391890 is an apocalyptic number.

10391890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10391890 is a deficient number, since it is larger than the sum of its proper divisors (8500550).

10391890 is a wasteful number, since it uses less digits than its factorization.

10391890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10397.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 10391890 is about 3223.6454519689. The cubic root of 10391890 is about 218.2218234198.

The spelling of 10391890 in words is "ten million, three hundred ninety-one thousand, eight hundred ninety".