161874730 has 8 divisors (see below), whose sum is σ = 291374532. Its totient is φ = 64749888.

The previous prime is 161874719. The next prime is 161874733. The reversal of 161874730 is 37478161.

It is a Cunningham number, because it is equal to 12723²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 161874729 + 1 = 12723^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 161874730.

It is not an unprimeable number, because it can be changed into a prime (161874733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8093727 + ... + 8093746.

Almost surely, 2^161874730 is an apocalyptic number.

161874730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161874730 is a deficient number, since it is larger than the sum of its proper divisors (129499802).

161874730 is a wasteful number, since it uses less digits than its factorization.

161874730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16187480.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 161874730 is about 12723.0000392989. Note that the first 4 decimals coincide. The cubic root of 161874730 is about 544.9956288402.

The spelling of 161874730 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, seven hundred thirty".