1971207 has 24 divisors (see below), whose sum is σ = 3309696. Its totient is φ = 1107216.

The previous prime is 1971199. The next prime is 1971209. The reversal of 1971207 is 7021791.

It is not a de Polignac number, because 1971207 - 2³ = 1971199 is a prime.

1971207 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3988 + ... + 4454.

It is an arithmetic number, because the mean of its divisors is an integer number (137904).

2^1971207 is an apocalyptic number.

1971207 is a deficient number, since it is larger than the sum of its proper divisors (1338489).

1971207 is a wasteful number, since it uses less digits than its factorization.

1971207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 1971207 is about 1403.9967948681. The cubic root of 1971207 is about 125.3845649981.

Adding to 1971207 its reverse (7021791), we get a palindrome (8992998).

The spelling of 1971207 in words is "one million, nine hundred seventy-one thousand, two hundred seven".