161307786 has 16 divisors (see below), whose sum is σ = 336642624. Its totient is φ = 51431424.

The previous prime is 161307721. The next prime is 161307791. The reversal of 161307786 is 687703161.

161307786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 584311 + ... + 584586.

It is an arithmetic number, because the mean of its divisors is an integer number (21040164).

Almost surely, 2^161307786 is an apocalyptic number.

161307786 is an abundant number, since it is smaller than the sum of its proper divisors (175334838).

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

161307786 is a wasteful number, since it uses less digits than its factorization.

161307786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168925.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 161307786 is about 12700.7002169172. The cubic root of 161307786 is about 544.3586271545.

The spelling of 161307786 in words is "one hundred sixty-one million, three hundred seven thousand, seven hundred eighty-six".