161806740 has 24 divisors (see below), whose sum is σ = 453059040. Its totient is φ = 43148448.

The previous prime is 161806739. The next prime is 161806741. The reversal of 161806740 is 47608161.

It is a happy number.

161806740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161806739) and next prime (161806741).

It is a super-2 number, since 2×161806740² = 52362842218855200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161806741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348330 + ... + 1348449.

It is an arithmetic number, because the mean of its divisors is an integer number (18877460).

Almost surely, 2^161806740 is an apocalyptic number.

161806740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161806740 is an abundant number, since it is smaller than the sum of its proper divisors (291252300).

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

161806740 is a wasteful number, since it uses less digits than its factorization.

161806740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696791 (or 2696789 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 161806740 is about 12720.3278259642. The cubic root of 161806740 is about 544.9193158340.

The spelling of 161806740 in words is "one hundred sixty-one million, eight hundred six thousand, seven hundred forty".