161867540 has 24 divisors (see below), whose sum is σ = 359917992. Its totient is φ = 60938240.

The previous prime is 161867527. The next prime is 161867551. The reversal of 161867540 is 45768161.

161867540 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 50438404 + 111429136 = 7102^2 + 10556^2 .

It is a super-2 number, since 2×161867540² = 52402201011303200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161867494 and 161867503.

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, 237701 + ... + 238380.

It is an arithmetic number, because the mean of its divisors is an integer number (14996583).

Almost surely, 2^161867540 is an apocalyptic number.

161867540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161867540 is an abundant number, since it is smaller than the sum of its proper divisors (198050452).

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

161867540 is a wasteful number, since it uses less digits than its factorization.

161867540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476107 (or 476105 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 161867540 is about 12722.7174770172. The cubic root of 161867540 is about 544.9875596857.

The spelling of 161867540 in words is "one hundred sixty-one million, eight hundred sixty-seven thousand, five hundred forty".