40720178 has 4 divisors (see below), whose sum is σ = 61080270. Its totient is φ = 20360088.

The previous prime is 40720157. The next prime is 40720181. The reversal of 40720178 is 87102704.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22118209 + 18601969 = 4703^2 + 4313^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40720178.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10180043 + ... + 10180046.

Almost surely, 2^40720178 is an apocalyptic number.

40720178 is a deficient number, since it is larger than the sum of its proper divisors (20360092).

40720178 is a wasteful number, since it uses less digits than its factorization.

40720178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20360091.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 40720178 is about 6381.2364005732. The cubic root of 40720178 is about 344.0354715991.

The spelling of 40720178 in words is "forty million, seven hundred twenty thousand, one hundred seventy-eight".