971640 has 48 divisors (see below), whose sum is σ = 3159000. Its totient is φ = 259008.

The previous prime is 971639. The next prime is 971651. The reversal of 971640 is 46179.

It is a congruent number.

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, 990 + ... + 1709.

2⁹⁷¹⁶⁴⁰ is an apocalyptic number.

971640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

971640 is an abundant number, since it is smaller than the sum of its proper divisors (2187360).

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

971640 is a wasteful number, since it uses less digits than its factorization.

971640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716 (or 2709 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 971640 is about 985.7180124153. The cubic root of 971640 is about 99.0455865965.

The spelling of 971640 in words is "nine hundred seventy-one thousand, six hundred forty".