1251512040 has 64 divisors (see below), whose sum is σ = 3762547200. Its totient is φ = 333024512.

The previous prime is 1251512039. The next prime is 1251512047. The reversal of 1251512040 is 402151521.

It is a junction number, because it is equal to n+sod(n) for n = 1251511998 and 1251512016.

It is not an unprimeable number, because it can be changed into a prime (1251512047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46594 + ... + 68366.

It is an arithmetic number, because the mean of its divisors is an integer number (58789800).

Almost surely, 2^1251512040 is an apocalyptic number.

1251512040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251512040 is an abundant number, since it is smaller than the sum of its proper divisors (2511035160).

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

1251512040 is a wasteful number, since it uses less digits than its factorization.

1251512040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22266 (or 22262 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1251512040 is about 35376.7160714502. The cubic root of 1251512040 is about 1077.6515155246.

Adding to 1251512040 its reverse (402151521), we get a palindrome (1653663561).

The spelling of 1251512040 in words is "one billion, two hundred fifty-one million, five hundred twelve thousand, forty".