1421647 has 2 divisors, whose sum is σ = 1421648. Its totient is φ = 1421646.

The previous prime is 1421639. The next prime is 1421663. The reversal of 1421647 is 7461241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1421647 - 2³ = 1421639 is a prime.

1421647 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710823 + 710824.

It is an arithmetic number, because the mean of its divisors is an integer number (710824).

2^1421647 is an apocalyptic number.

1421647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421647 is an equidigital number, since it uses as much as digits as its factorization.

1421647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 25.

The square root of 1421647 is about 1192.3283943612. The cubic root of 1421647 is about 112.4425253746.

Adding to 1421647 its reverse (7461241), we get a palindrome (8882888).

The spelling of 1421647 in words is "one million, four hundred twenty-one thousand, six hundred forty-seven".