1402421 has 2 divisors, whose sum is σ = 1402422. Its totient is φ = 1402420.

The previous prime is 1402417. The next prime is 1402439. The reversal of 1402421 is 1242041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 168100 = 1111^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1402421 - 2² = 1402417 is a prime.

It is a super-2 number, since 2×1402421² = 3933569322482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1402396 and 1402405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1405421) 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, 701210 + 701211.

It is an arithmetic number, because the mean of its divisors is an integer number (701211).

2^1402421 is an apocalyptic number.

It is an amenable number.

1402421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1402421 is an equidigital number, since it uses as much as digits as its factorization.

1402421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1402421 is about 1184.2385739369. The cubic root of 1402421 is about 111.9333415000.

Adding to 1402421 its reverse (1242041), we get a palindrome (2644462).

The spelling of 1402421 in words is "one million, four hundred two thousand, four hundred twenty-one".