1420651 has 2 divisors, whose sum is σ = 1420652. Its totient is φ = 1420650.

The previous prime is 1420633. The next prime is 1420667. The reversal of 1420651 is 1560241.

It is a strong prime.

It is an emirp because it is prime and its reverse (1560241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1420651 is a prime.

It is not a weakly prime, because it can be changed into another prime (1420621) 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, 710325 + 710326.

It is an arithmetic number, because the mean of its divisors is an integer number (710326).

2^1420651 is an apocalyptic number.

1420651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420651 is an equidigital number, since it uses as much as digits as its factorization.

1420651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1420651 is about 1191.9106510137. The cubic root of 1420651 is about 112.4162603173.

Adding to 1420651 its reverse (1560241), we get a palindrome (2980892).

The spelling of 1420651 in words is "one million, four hundred twenty thousand, six hundred fifty-one".