40779978 has 16 divisors (see below), whose sum is σ = 82477440. Its totient is φ = 13440416.

The previous prime is 40779967. The next prime is 40780001. The reversal of 40779978 is 87997704.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40779978.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 37650 + ... + 38717.

It is an arithmetic number, because the mean of its divisors is an integer number (5154840).

Almost surely, 2^40779978 is an apocalyptic number.

40779978 is an abundant number, since it is smaller than the sum of its proper divisors (41697462).

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

40779978 is a wasteful number, since it uses less digits than its factorization.

40779978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76461.

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 40779978 is about 6385.9202938966. The cubic root of 40779978 is about 344.2038014000.

The spelling of 40779978 in words is "forty million, seven hundred seventy-nine thousand, nine hundred seventy-eight".