1402391 has 2 divisors, whose sum is σ = 1402392. Its totient is φ = 1402390.

The previous prime is 1402369. The next prime is 1402397. The reversal of 1402391 is 1932041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1402391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1402397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 701195 + 701196.

It is an arithmetic number, because the mean of its divisors is an integer number (701196).

2^1402391 is an apocalyptic number.

1402391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1402391 is an equidigital number, since it uses as much as digits as its factorization.

1402391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1402391 is about 1184.2259075024. The cubic root of 1402391 is about 111.9325433507.

The spelling of 1402391 in words is "one million, four hundred two thousand, three hundred ninety-one".