1391457 has 8 divisors (see below), whose sum is σ = 1862784. Its totient is φ = 923888.

The previous prime is 1391447. The next prime is 1391461. The reversal of 1391457 is 7541931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1391457 - 2⁴ = 1391441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1391407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88 + ... + 1670.

It is an arithmetic number, because the mean of its divisors is an integer number (232848).

2^1391457 is an apocalyptic number.

It is an amenable number.

1391457 is a deficient number, since it is larger than the sum of its proper divisors (471327).

1391457 is a wasteful number, since it uses less digits than its factorization.

1391457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879.

The product of its digits is 3780, while the sum is 30.

The square root of 1391457 is about 1179.6003560528. The cubic root of 1391457 is about 111.6408831340.

It can be divided in two parts, 139 and 1457, that added together give a triangular number (1596 = T₅₆).

The spelling of 1391457 in words is "one million, three hundred ninety-one thousand, four hundred fifty-seven".