1251696340 has 48 divisors (see below), whose sum is σ = 2746275840. Its totient is φ = 478311680.

The previous prime is 1251696301. The next prime is 1251696353. The reversal of 1251696340 is 436961521.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1251696340.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 591885 + ... + 593995.

It is an arithmetic number, because the mean of its divisors is an integer number (57214080).

Almost surely, 2^1251696340 is an apocalyptic number.

1251696340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251696340 is an abundant number, since it is smaller than the sum of its proper divisors (1494579500).

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

1251696340 is a wasteful number, since it uses less digits than its factorization.

1251696340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432 (or 3430 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1251696340 is about 35379.3207961939. The cubic root of 1251696340 is about 1077.7044119197.

The spelling of 1251696340 in words is "one billion, two hundred fifty-one million, six hundred ninety-six thousand, three hundred forty".