40047777 has 40 divisors (see below), whose sum is σ = 74597952. Its totient is φ = 20800800.

The previous prime is 40047751. The next prime is 40047779. The reversal of 40047777 is 77774004.

It is not a de Polignac number, because 40047777 - 2¹⁸ = 39785633 is a prime.

40047777 is a modest number, since divided by 7777 gives 4004 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40047779) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3027 + ... + 9447.

Almost surely, 2^40047777 is an apocalyptic number.

It is an amenable number.

40047777 is a deficient number, since it is larger than the sum of its proper divisors (34550175).

40047777 is a wasteful number, since it uses less digits than its factorization.

40047777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6451 (or 6442 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 36.

The square root of 40047777 is about 6328.3312966374. The cubic root of 40047777 is about 342.1312976940.

It can be divided in two parts, 4004 and 7777, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 40047777 in words is "forty million, forty-seven thousand, seven hundred seventy-seven".