1251052040 has 32 divisors (see below), whose sum is σ = 3216991680. Its totient is φ = 428932032.

The previous prime is 1251052031. The next prime is 1251052067. The reversal of 1251052040 is 402501521.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2233742 + ... + 2234301.

It is an arithmetic number, because the mean of its divisors is an integer number (100530990).

Almost surely, 2^1251052040 is an apocalyptic number.

1251052040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251052040 is an abundant number, since it is smaller than the sum of its proper divisors (1965939640).

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

1251052040 is a wasteful number, since it uses less digits than its factorization.

1251052040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468061 (or 4468057 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1251052040 is about 35370.2140225360. The cubic root of 1251052040 is about 1077.5194671361.

Adding to 1251052040 its reverse (402501521), we get a palindrome (1653553561).

The spelling of 1251052040 in words is "one billion, two hundred fifty-one million, fifty-two thousand, forty".