15515140 has 12 divisors (see below), whose sum is σ = 32581836. Its totient is φ = 6206048.

The previous prime is 15515119. The next prime is 15515147. The reversal of 15515140 is 4151551.

It is a happy number.

15515140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10745284 + 4769856 = 3278^2 + 2184^2 .

It is not an unprimeable number, because it can be changed into a prime (15515147) 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, 387859 + ... + 387898.

It is an arithmetic number, because the mean of its divisors is an integer number (2715153).

Almost surely, 2^15515140 is an apocalyptic number.

15515140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15515140 is an abundant number, since it is smaller than the sum of its proper divisors (17066696).

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

15515140 is a wasteful number, since it uses less digits than its factorization.

15515140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775766 (or 775764 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 15515140 is about 3938.9262496269. The cubic root of 15515140 is about 249.4127014018.

Adding to 15515140 its reverse (4151551), we get a palindrome (19666691).

The spelling of 15515140 in words is "fifteen million, five hundred fifteen thousand, one hundred forty".