1025515240 has 16 divisors (see below), whose sum is σ = 2307409380. Its totient is φ = 410206080.

The previous prime is 1025515207. The next prime is 1025515243. The reversal of 1025515240 is 425155201.

It can be written as a sum of positive squares in 2 ways, for example, as 909263716 + 116251524 = 30154^2 + 10782^2 .

It is not an unprimeable number, because it can be changed into a prime (1025515243) 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, 12818901 + ... + 12818980.

Almost surely, 2^1025515240 is an apocalyptic number.

1025515240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025515240 is an abundant number, since it is smaller than the sum of its proper divisors (1281894140).

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

1025515240 is a wasteful number, since it uses less digits than its factorization.

1025515240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25637892 (or 25637888 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1025515240 is about 32023.6668731112. Note that the first 3 decimals coincide. The cubic root of 1025515240 is about 1008.4337518703.

The spelling of 1025515240 in words is "one billion, twenty-five million, five hundred fifteen thousand, two hundred forty".