161840236 has 12 divisors (see below), whose sum is σ = 295534512. Its totient is φ = 77401808.

The previous prime is 161840191. The next prime is 161840281. The reversal of 161840236 is 632048161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161840191) and next prime (161840281).

It is a junction number, because it is equal to n+sod(n) for n = 161840198 and 161840207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879475 + ... + 879658.

It is an arithmetic number, because the mean of its divisors is an integer number (24627876).

Almost surely, 2^161840236 is an apocalyptic number.

It is an amenable number.

161840236 is a deficient number, since it is larger than the sum of its proper divisors (133694276).

161840236 is a wasteful number, since it uses less digits than its factorization.

161840236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759160 (or 1759158 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 161840236 is about 12721.6443905652. The cubic root of 161840236 is about 544.9569149230.

Adding to 161840236 its reverse (632048161), we get a palindrome (793888397).

The spelling of 161840236 in words is "one hundred sixty-one million, eight hundred forty thousand, two hundred thirty-six".