1642247 has 2 divisors, whose sum is σ = 1642248. Its totient is φ = 1642246.

The previous prime is 1642243. The next prime is 1642259. The reversal of 1642247 is 7422461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1642247 - 2² = 1642243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821123 + 821124.

It is an arithmetic number, because the mean of its divisors is an integer number (821124).

2^1642247 is an apocalyptic number.

1642247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642247 is an equidigital number, since it uses as much as digits as its factorization.

1642247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 1642247 is about 1281.5018532956. The cubic root of 1642247 is about 117.9812045138.

The spelling of 1642247 in words is "one million, six hundred forty-two thousand, two hundred forty-seven".