1971723 has 12 divisors (see below), whose sum is σ = 2847480. Its totient is φ = 1213056.

The previous prime is 1971709. The next prime is 1971727. The reversal of 1971723 is 3271791.

It is not a de Polignac number, because 1971723 - 2⁴ = 1971707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1971727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1438 + ... + 2451.

It is an arithmetic number, because the mean of its divisors is an integer number (237290).

2^1971723 is an apocalyptic number.

1971723 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1971723 is a deficient number, since it is larger than the sum of its proper divisors (875757).

1971723 is a wasteful number, since it uses less digits than its factorization.

1971723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3918 (or 3905 counting only the distinct ones).

The product of its digits is 2646, while the sum is 30.

The square root of 1971723 is about 1404.1805439473. The cubic root of 1971723 is about 125.3955046223.

The spelling of 1971723 in words is "one million, nine hundred seventy-one thousand, seven hundred twenty-three".