1971396 has 36 divisors (see below), whose sum is σ = 5695872. Its totient is φ = 563184.

The previous prime is 1971377. The next prime is 1971401. The reversal of 1971396 is 6931791.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1971396.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3660 + ... + 4163.

2^1971396 is an apocalyptic number.

It is an amenable number.

1971396 is an abundant number, since it is smaller than the sum of its proper divisors (3724476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1971396 is a wasteful number, since it uses less digits than its factorization.

1971396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7840 (or 7835 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 1971396 is about 1404.0641011008. The cubic root of 1971396 is about 125.3885721750.

Subtracting from 1971396 its product of digits (10206), we obtain a triangular number (1961190 = T₁₉₈₀).

The spelling of 1971396 in words is "one million, nine hundred seventy-one thousand, three hundred ninety-six".