15825140 has 12 divisors (see below), whose sum is σ = 33232836. Its totient is φ = 6330048.

The previous prime is 15825137. The next prime is 15825149. The reversal of 15825140 is 4152851.

It can be written as a sum of positive squares in 2 ways, for example, as 11142244 + 4682896 = 3338^2 + 2164^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15825149) 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, 395609 + ... + 395648.

It is an arithmetic number, because the mean of its divisors is an integer number (2769403).

Almost surely, 2^15825140 is an apocalyptic number.

15825140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15825140 is an abundant number, since it is smaller than the sum of its proper divisors (17407696).

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

15825140 is a wasteful number, since it uses less digits than its factorization.

15825140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791266 (or 791264 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 15825140 is about 3978.0824526397. The cubic root of 15825140 is about 251.0628880055.

Adding to 15825140 its reverse (4152851), we get a palindrome (19977991).

The spelling of 15825140 in words is "fifteen million, eight hundred twenty-five thousand, one hundred forty".