40513778 has 4 divisors (see below), whose sum is σ = 60770670. Its totient is φ = 20256888.

The previous prime is 40513769. The next prime is 40513789. The reversal of 40513778 is 87731504.

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., 21003889 + 19509889 = 4583^2 + 4417^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128443 + ... + 10128446.

Almost surely, 2^40513778 is an apocalyptic number.

40513778 is a deficient number, since it is larger than the sum of its proper divisors (20256892).

40513778 is a wasteful number, since it uses less digits than its factorization.

40513778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20256891.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 40513778 is about 6365.0434405430. The cubic root of 40513778 is about 343.4532112466.

The spelling of 40513778 in words is "forty million, five hundred thirteen thousand, seven hundred seventy-eight".