1251340540 has 12 divisors (see below), whose sum is σ = 2627815176. Its totient is φ = 500536208.

The previous prime is 1251340469. The next prime is 1251340543. The reversal of 1251340540 is 450431521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251340543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31283494 + ... + 31283533.

It is an arithmetic number, because the mean of its divisors is an integer number (218984598).

Almost surely, 2^1251340540 is an apocalyptic number.

1251340540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251340540 is an abundant number, since it is smaller than the sum of its proper divisors (1376474636).

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

1251340540 is a wasteful number, since it uses less digits than its factorization.

1251340540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62567036 (or 62567034 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1251340540 is about 35374.2920777222. The cubic root of 1251340540 is about 1077.6022882242.

The spelling of 1251340540 in words is "one billion, two hundred fifty-one million, three hundred forty thousand, five hundred forty".