1340631 has 16 divisors (see below), whose sum is σ = 2013920. Its totient is φ = 892296.

The previous prime is 1340627. The next prime is 1340639. The reversal of 1340631 is 1360431.

1340631 is a `hidden beast` number, since 1 + 34 + 0 + 631 = 666.

It is not a de Polignac number, because 1340631 - 2² = 1340627 is a prime.

It is a super-2 number, since 2×1340631² = 3594582956322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1881 + ... + 2493.

It is an arithmetic number, because the mean of its divisors is an integer number (125870).

2^1340631 is an apocalyptic number.

1340631 is a deficient number, since it is larger than the sum of its proper divisors (673289).

1340631 is an frugal number, since it uses more digits than its factorization.

1340631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1340631 is about 1157.8562086891. The cubic root of 1340631 is about 110.2646794282.

The spelling of 1340631 in words is "one million, three hundred forty thousand, six hundred thirty-one".