40781194 has 4 divisors (see below), whose sum is σ = 61171794. Its totient is φ = 20390596.

The previous prime is 40781189. The next prime is 40781197. The reversal of 40781194 is 49118704.

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., 32913169 + 7868025 = 5737^2 + 2805^2 .

It is not an unprimeable number, because it can be changed into a prime (40781197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10195297 + ... + 10195300.

Almost surely, 2^40781194 is an apocalyptic number.

40781194 is a deficient number, since it is larger than the sum of its proper divisors (20390600).

40781194 is a wasteful number, since it uses less digits than its factorization.

40781194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20390599.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 40781194 is about 6386.0155026433. The cubic root of 40781194 is about 344.2072225859.

Adding to 40781194 its reverse (49118704), we get a palindrome (89899898).

The spelling of 40781194 in words is "forty million, seven hundred eighty-one thousand, one hundred ninety-four".