165917940 has 24 divisors (see below), whose sum is σ = 464570400. Its totient is φ = 44244768.

The previous prime is 165917923. The next prime is 165917957. The reversal of 165917940 is 49719561.

It is an interprime number because it is at equal distance from previous prime (165917923) and next prime (165917957).

It is a junction number, because it is equal to n+sod(n) for n = 165917892 and 165917901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382590 + ... + 1382709.

It is an arithmetic number, because the mean of its divisors is an integer number (19357100).

Almost surely, 2^165917940 is an apocalyptic number.

165917940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165917940 is an abundant number, since it is smaller than the sum of its proper divisors (298652460).

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

165917940 is a wasteful number, since it uses less digits than its factorization.

165917940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765311 (or 2765309 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 165917940 is about 12880.9137874609. The cubic root of 165917940 is about 549.4958907107.

It can be divided in two parts, 16591 and 7940, that added together give a triangular number (24531 = T₂₂₁).

The spelling of 165917940 in words is "one hundred sixty-five million, nine hundred seventeen thousand, nine hundred forty".