10388621 has 4 divisors (see below), whose sum is σ = 10642044. Its totient is φ = 10135200.

The previous prime is 10388593. The next prime is 10388629. The reversal of 10388621 is 12688301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12688301 = 251 ⋅50551.

It can be written as a sum of positive squares in 2 ways, for example, as 1322500 + 9066121 = 1150^2 + 3011^2 .

It is not a de Polignac number, because 10388621 - 2¹⁴ = 10372237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10388629) 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 3 ways as a sum of consecutive naturals, for example, 126650 + ... + 126731.

It is an arithmetic number, because the mean of its divisors is an integer number (2660511).

Almost surely, 2^10388621 is an apocalyptic number.

It is an amenable number.

10388621 is a deficient number, since it is larger than the sum of its proper divisors (253423).

10388621 is an equidigital number, since it uses as much as digits as its factorization.

10388621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253422.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 10388621 is about 3223.1383774204. The cubic root of 10388621 is about 218.1989388449.

The spelling of 10388621 in words is "ten million, three hundred eighty-eight thousand, six hundred twenty-one".