1391457844 has 24 divisors (see below), whose sum is σ = 2794476608. Its totient is φ = 593861760.

The previous prime is 1391457833. The next prime is 1391457883. The reversal of 1391457844 is 4487541931.

It is a junction number, because it is equal to n+sod(n) for n = 1391457794 and 1391457803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96354 + ... + 109849.

Almost surely, 2^1391457844 is an apocalyptic number.

1391457844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1391457844 is an abundant number, since it is smaller than the sum of its proper divisors (1403018764).

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

1391457844 is a wasteful number, since it uses less digits than its factorization.

1391457844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206455 (or 206453 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 1391457844 is about 37302.2498517181. The cubic root of 1391457844 is about 1116.4090570625.

The spelling of 1391457844 in words is "one billion, three hundred ninety-one million, four hundred fifty-seven thousand, eight hundred forty-four".