1251045040 has 40 divisors (see below), whose sum is σ = 3324206880. Its totient is φ = 428929536.

The previous prime is 1251045017. The next prime is 1251045043. The reversal of 1251045040 is 405401521.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1251045040² = 3130227384217203200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1251045043) 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, 1116445 + ... + 1117564.

It is an arithmetic number, because the mean of its divisors is an integer number (83105172).

Almost surely, 2^1251045040 is an apocalyptic number.

1251045040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251045040 is an abundant number, since it is smaller than the sum of its proper divisors (2073161840).

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

1251045040 is a wasteful number, since it uses less digits than its factorization.

1251045040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234029 (or 2234023 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1251045040 is about 35370.1150690806. The cubic root of 1251045040 is about 1077.5174574541.

Adding to 1251045040 its reverse (405401521), we get a palindrome (1656446561).

The spelling of 1251045040 in words is "one billion, two hundred fifty-one million, forty-five thousand, forty".