1391909428 has 24 divisors (see below), whose sum is σ = 2997959552. Its totient is φ = 550645344.

The previous prime is 1391909413. The next prime is 1391909447. The reversal of 1391909428 is 8249091931.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 1911600 + ... + 1912327.

Almost surely, 2^1391909428 is an apocalyptic number.

It is an amenable number.

1391909428 is an abundant number, since it is smaller than the sum of its proper divisors (1606050124).

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

1391909428 is a wasteful number, since it uses less digits than its factorization.

1391909428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823951 (or 3823949 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1391909428 is about 37308.3024004041. The cubic root of 1391909428 is about 1116.5298172039.

The spelling of 1391909428 in words is "one billion, three hundred ninety-one million, nine hundred nine thousand, four hundred twenty-eight".