1391226928 has 120 divisors (see below), whose sum is σ = 3444827136. Its totient is φ = 532396800.

The previous prime is 1391226913. The next prime is 1391226989. The reversal of 1391226928 is 8296221931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 585583 + ... + 587953.

Almost surely, 2^1391226928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391226928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1722413568).

1391226928 is an abundant number, since it is smaller than the sum of its proper divisors (2053600208).

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

1391226928 is a wasteful number, since it uses less digits than its factorization.

1391226928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443 (or 2424 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 1391226928 is about 37299.1545212489. The cubic root of 1391226928 is about 1116.3472966633.

The spelling of 1391226928 in words is "one billion, three hundred ninety-one million, two hundred twenty-six thousand, nine hundred twenty-eight".