1340731 has 4 divisors (see below), whose sum is σ = 1532272. Its totient is φ = 1149192.

The previous prime is 1340723. The next prime is 1340743. The reversal of 1340731 is 1370431.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1340731 - 2³ = 1340723 is a prime.

It is a super-2 number, since 2×1340731² = 3595119228722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1340699 and 1340708.

It is not an unprimeable number, because it can be changed into a prime (1340701) 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, 95760 + ... + 95773.

It is an arithmetic number, because the mean of its divisors is an integer number (383068).

2^1340731 is an apocalyptic number.

1340731 is a deficient number, since it is larger than the sum of its proper divisors (191541).

1340731 is an equidigital number, since it uses as much as digits as its factorization.

1340731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191540.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 1340731 is about 1157.8993911390. The cubic root of 1340731 is about 110.2674209714.

The spelling of 1340731 in words is "one million, three hundred forty thousand, seven hundred thirty-one".