1420399 has 2 divisors, whose sum is σ = 1420400. Its totient is φ = 1420398.

The previous prime is 1420373. The next prime is 1420403. The reversal of 1420399 is 9930241.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1420399 - 2¹⁹ = 896111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1420369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710199 + 710200.

It is an arithmetic number, because the mean of its divisors is an integer number (710200).

2^1420399 is an apocalyptic number.

1420399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420399 is an equidigital number, since it uses as much as digits as its factorization.

1420399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1420399 is about 1191.8049337035. The cubic root of 1420399 is about 112.4096129956.

It can be divided in two parts, 1420 and 399, that multiplied together give a triangular number (566580 = T₁₀₆₄).

The spelling of 1420399 in words is "one million, four hundred twenty thousand, three hundred ninety-nine".