1971956 has 18 divisors (see below), whose sum is σ = 4014738. Its totient is φ = 845040.

The previous prime is 1971911. The next prime is 1971967. The reversal of 1971956 is 6591791.

It can be written as a sum of positive squares in only one way, i.e., 1731856 + 240100 = 1316^2 + 490^2 .

It is a super-2 number, since 2×1971956² = 7777220931872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4835 + ... + 5226.

It is an arithmetic number, because the mean of its divisors is an integer number (223041).

2^1971956 is an apocalyptic number.

It is an amenable number.

1971956 is an abundant number, since it is smaller than the sum of its proper divisors (2042782).

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

1971956 is a wasteful number, since it uses less digits than its factorization.

1971956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10079 (or 10070 counting only the distinct ones).

The product of its digits is 17010, while the sum is 38.

The square root of 1971956 is about 1404.2635080354. The cubic root of 1971956 is about 125.4004437883.

The spelling of 1971956 in words is "one million, nine hundred seventy-one thousand, nine hundred fifty-six".