40778783 has 4 divisors (see below), whose sum is σ = 41548248. Its totient is φ = 40009320.

The previous prime is 40778761. The next prime is 40778791. The reversal of 40778783 is 38787704.

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

It is a cyclic number.

It is not a de Polignac number, because 40778783 - 2⁶ = 40778719 is a prime.

It is a super-2 number, since 2×40778783² = 3325818285922178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40778083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384653 + ... + 384758.

It is an arithmetic number, because the mean of its divisors is an integer number (10387062).

Almost surely, 2^40778783 is an apocalyptic number.

40778783 is a deficient number, since it is larger than the sum of its proper divisors (769465).

40778783 is an equidigital number, since it uses as much as digits as its factorization.

40778783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769464.

The product of its (nonzero) digits is 263424, while the sum is 44.

The square root of 40778783 is about 6385.8267279969. The cubic root of 40778783 is about 344.2004392308.

The spelling of 40778783 in words is "forty million, seven hundred seventy-eight thousand, seven hundred eighty-three".