161857746 has 24 divisors (see below), whose sum is σ = 351287820. Its totient is φ = 53860896.

The previous prime is 161857733. The next prime is 161857747. The reversal of 161857746 is 647758161.

It can be written as a sum of positive squares in 2 ways, for example, as 148571721 + 13286025 = 12189^2 + 3645^2 .

It is not an unprimeable number, because it can be changed into a prime (161857747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3700 + ... + 18368.

Almost surely, 2^161857746 is an apocalyptic number.

161857746 is an abundant number, since it is smaller than the sum of its proper divisors (189430074).

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

161857746 is a wasteful number, since it uses less digits than its factorization.

161857746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15290 (or 15287 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 161857746 is about 12722.3325691478. The cubic root of 161857746 is about 544.9765677438.

The spelling of 161857746 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, seven hundred forty-six".