1391247 has 48 divisors (see below), whose sum is σ = 2515968. Its totient is φ = 728640.

The previous prime is 1391239. The next prime is 1391261. The reversal of 1391247 is 7421931.

It is not a de Polignac number, because 1391247 - 2³ = 1391239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1391247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29578 + ... + 29624.

It is an arithmetic number, because the mean of its divisors is an integer number (52416).

2^1391247 is an apocalyptic number.

1391247 is a deficient number, since it is larger than the sum of its proper divisors (1124721).

1391247 is a wasteful number, since it uses less digits than its factorization.

1391247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 97 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1391247 is about 1179.5113394961. The cubic root of 1391247 is about 111.6352665357.

The spelling of 1391247 in words is "one million, three hundred ninety-one thousand, two hundred forty-seven".