1391971 has 8 divisors (see below), whose sum is σ = 1645920. Its totient is φ = 1151808.

The previous prime is 1391969. The next prime is 1391981. The reversal of 1391971 is 1791931.

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

It is not a de Polignac number, because 1391971 - 2¹ = 1391969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3226 + ... + 3631.

It is an arithmetic number, because the mean of its divisors is an integer number (205740).

2^1391971 is an apocalyptic number.

1391971 is a deficient number, since it is larger than the sum of its proper divisors (253949).

1391971 is an equidigital number, since it uses as much as digits as its factorization.

1391971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6893.

The product of its digits is 1701, while the sum is 31.

The square root of 1391971 is about 1179.8182063352. The cubic root of 1391971 is about 111.6546280430.

The spelling of 1391971 in words is "one million, three hundred ninety-one thousand, nine hundred seventy-one".