1240831 has 2 divisors, whose sum is σ = 1240832. Its totient is φ = 1240830.

The previous prime is 1240817. The next prime is 1240859. The reversal of 1240831 is 1380421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1240831 - 2⁷ = 1240703 is a prime.

It is a super-2 number, since 2×1240831² = 3079323141122, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1240799 and 1240808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620415 + 620416.

It is an arithmetic number, because the mean of its divisors is an integer number (620416).

2^1240831 is an apocalyptic number.

1240831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240831 is an equidigital number, since it uses as much as digits as its factorization.

1240831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1240831 is about 1113.9259400876. The cubic root of 1240831 is about 107.4577010437.

The spelling of 1240831 in words is "one million, two hundred forty thousand, eight hundred thirty-one".