40247778 has 8 divisors (see below), whose sum is σ = 80495568. Its totient is φ = 13415924.

The previous prime is 40247777. The next prime is 40247807. The reversal of 40247778 is 87774204.

It is a sphenic number, since it is the product of 3 distinct primes.

40247778 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40247777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3353976 + ... + 3353987.

It is an arithmetic number, because the mean of its divisors is an integer number (10061946).

Almost surely, 2^40247778 is an apocalyptic number.

40247778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40247778 is a wasteful number, since it uses less digits than its factorization.

40247778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707968.

The product of its (nonzero) digits is 87808, while the sum is 39.

The square root of 40247778 is about 6344.1136496756. The cubic root of 40247778 is about 342.6998936139.

The spelling of 40247778 in words is "forty million, two hundred forty-seven thousand, seven hundred seventy-eight".