10515440 has 40 divisors (see below), whose sum is σ = 26331648. Its totient is φ = 3882240.

The previous prime is 10515419. The next prime is 10515443. The reversal of 10515440 is 4451501.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×10515440² = 221148956787200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10515443) 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, 4016 + ... + 6095.

Almost surely, 2^10515440 is an apocalyptic number.

10515440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10515440 is an abundant number, since it is smaller than the sum of its proper divisors (15816208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10515440 is a wasteful number, since it uses less digits than its factorization.

10515440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10137 (or 10131 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 10515440 is about 3242.7519177390. The cubic root of 10515440 is about 219.0832374042.

Adding to 10515440 its reverse (4451501), we get a palindrome (14966941).

The spelling of 10515440 in words is "ten million, five hundred fifteen thousand, four hundred forty".