1971445 has 32 divisors (see below), whose sum is σ = 2949120. Its totient is φ = 1235520.

The previous prime is 1971443. The next prime is 1971451. The reversal of 1971445 is 5441791.

It is not a de Polignac number, because 1971445 - 2¹ = 1971443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24916 + ... + 24994.

It is an arithmetic number, because the mean of its divisors is an integer number (92160).

2^1971445 is an apocalyptic number.

It is an amenable number.

1971445 is a deficient number, since it is larger than the sum of its proper divisors (977675).

1971445 is a wasteful number, since it uses less digits than its factorization.

1971445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145.

The product of its digits is 5040, while the sum is 31.

The square root of 1971445 is about 1404.0815503382. The cubic root of 1971445 is about 125.3896110309.

The spelling of 1971445 in words is "one million, nine hundred seventy-one thousand, four hundred forty-five".