10205391 has 16 divisors (see below), whose sum is σ = 15600384. Its totient is φ = 5813184.

The previous prime is 10205383. The next prime is 10205401. The reversal of 10205391 is 19350201.

It is not a de Polignac number, because 10205391 - 2³ = 10205383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10205381) 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, 8755 + ... + 9851.

It is an arithmetic number, because the mean of its divisors is an integer number (975024).

Almost surely, 2^10205391 is an apocalyptic number.

10205391 is a deficient number, since it is larger than the sum of its proper divisors (5394993).

10205391 is a wasteful number, since it uses less digits than its factorization.

10205391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 10205391 is about 3194.5877668331. The cubic root of 10205391 is about 216.9084892378.

Adding to 10205391 its reverse (19350201), we get a palindrome (29555592).

The spelling of 10205391 in words is "ten million, two hundred five thousand, three hundred ninety-one".