1525143540 has 24 divisors (see below), whose sum is σ = 4270402080. Its totient is φ = 406704928.

The previous prime is 1525143497. The next prime is 1525143541. The reversal of 1525143540 is 453415251.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1525143498 and 1525143507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1525143541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12709470 + ... + 12709589.

It is an arithmetic number, because the mean of its divisors is an integer number (177933420).

Almost surely, 2^1525143540 is an apocalyptic number.

1525143540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1525143540 is an abundant number, since it is smaller than the sum of its proper divisors (2745258540).

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

1525143540 is a wasteful number, since it uses less digits than its factorization.

1525143540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25419071 (or 25419069 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1525143540 is about 39053.0861776633. The cubic root of 1525143540 is about 1151.0748715324.

Adding to 1525143540 its reverse (453415251), we get a palindrome (1978558791).

The spelling of 1525143540 in words is "one billion, five hundred twenty-five million, one hundred forty-three thousand, five hundred forty".