180040394 has 4 divisors (see below), whose sum is σ = 270060594. Its totient is φ = 90020196.

The previous prime is 180040391. The next prime is 180040403. The reversal of 180040394 is 493040081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493040081 = 2399 ⋅205519.

It can be written as a sum of positive squares in only one way, i.e., 100741369 + 79299025 = 10037^2 + 8905^2 .

It is not an unprimeable number, because it can be changed into a prime (180040391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45010097 + ... + 45010100.

Almost surely, 2^180040394 is an apocalyptic number.

180040394 is a deficient number, since it is larger than the sum of its proper divisors (90020200).

180040394 is an equidigital number, since it uses as much as digits as its factorization.

180040394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90020199.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 180040394 is about 13417.9131760494. The cubic root of 180040394 is about 564.6638499578.

The spelling of 180040394 in words is "one hundred eighty million, forty thousand, three hundred ninety-four".