1391544428 has 12 divisors (see below), whose sum is σ = 2494598232. Its totient is φ = 678802080.

The previous prime is 1391544421. The next prime is 1391544431. The reversal of 1391544428 is 8244451931.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (1391544421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4242350 + ... + 4242677.

It is an arithmetic number, because the mean of its divisors is an integer number (207883186).

Almost surely, 2^1391544428 is an apocalyptic number.

It is an amenable number.

1391544428 is a deficient number, since it is larger than the sum of its proper divisors (1103053804).

1391544428 is a wasteful number, since it uses less digits than its factorization.

1391544428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8485072 (or 8485070 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 1391544428 is about 37303.4104070928. The cubic root of 1391544428 is about 1116.4322129100.

The spelling of 1391544428 in words is "one billion, three hundred ninety-one million, five hundred forty-four thousand, four hundred twenty-eight".