1997407 has 2 divisors, whose sum is σ = 1997408. Its totient is φ = 1997406.

The previous prime is 1997351. The next prime is 1997419. The reversal of 1997407 is 7047991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1997407 - 2¹¹ = 1995359 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998703 + 998704.

It is an arithmetic number, because the mean of its divisors is an integer number (998704).

2^1997407 is an apocalyptic number.

1997407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997407 is an equidigital number, since it uses as much as digits as its factorization.

1997407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 1997407 is about 1413.2965010924. The cubic root of 1997407 is about 125.9376318532.

The spelling of 1997407 in words is "one million, nine hundred ninety-seven thousand, four hundred seven".