1251390396 has 12 divisors (see below), whose sum is σ = 2919910952. Its totient is φ = 417130128.

The previous prime is 1251390373. The next prime is 1251390403. The reversal of 1251390396 is 6930931521.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 52141255 + ... + 52141278.

Almost surely, 2^1251390396 is an apocalyptic number.

It is an amenable number.

1251390396 is an abundant number, since it is smaller than the sum of its proper divisors (1668520556).

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

1251390396 is a wasteful number, since it uses less digits than its factorization.

1251390396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104282540 (or 104282538 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 1251390396 is about 35374.9967632507. The cubic root of 1251390396 is about 1077.6165993368.

The spelling of 1251390396 in words is "one billion, two hundred fifty-one million, three hundred ninety thousand, three hundred ninety-six".