1251989046 has 48 divisors (see below), whose sum is σ = 3382000128. Its totient is φ = 325191600.

The previous prime is 1251989023. The next prime is 1251989087. The reversal of 1251989046 is 6409891521.

1251989046 is a `hidden beast` number, since 1 + 2 + 519 + 8 + 90 + 46 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1251988992 and 1251989010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 450270 + ... + 453041.

It is an arithmetic number, because the mean of its divisors is an integer number (70458336).

Almost surely, 2^1251989046 is an apocalyptic number.

1251989046 is an abundant number, since it is smaller than the sum of its proper divisors (2130011082).

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

1251989046 is a wasteful number, since it uses less digits than its factorization.

1251989046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903337 (or 903334 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1251989046 is about 35383.4572363979. The cubic root of 1251989046 is about 1077.7884115160.

The spelling of 1251989046 in words is "one billion, two hundred fifty-one million, nine hundred eighty-nine thousand, forty-six".