10402505 has 4 divisors (see below), whose sum is σ = 12483012. Its totient is φ = 8322000.

The previous prime is 10402501. The next prime is 10402523. The reversal of 10402505 is 50520401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50520401 = 1123 ⋅44987.

It can be written as a sum of positive squares in 2 ways, for example, as 1227664 + 9174841 = 1108^2 + 3029^2 .

It is not a de Polignac number, because 10402505 - 2² = 10402501 is a prime.

It is a super-2 number, since 2×10402505² = 216424220550050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10402501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1040246 + ... + 1040255.

It is an arithmetic number, because the mean of its divisors is an integer number (3120753).

Almost surely, 2^10402505 is an apocalyptic number.

It is an amenable number.

10402505 is a deficient number, since it is larger than the sum of its proper divisors (2080507).

10402505 is an equidigital number, since it uses as much as digits as its factorization.

10402505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080506.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 10402505 is about 3225.2914596979. The cubic root of 10402505 is about 218.2961004564.

Adding to 10402505 its reverse (50520401), we get a palindrome (60922906).

The spelling of 10402505 in words is "ten million, four hundred two thousand, five hundred five".