7803978 has 32 divisors (see below), whose sum is σ = 19211136. Its totient is φ = 2058048.

The previous prime is 7803977. The next prime is 7803979. The reversal of 7803978 is 8793087.

It is an interprime number because it is at equal distance from previous prime (7803977) and next prime (7803979).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7803973) 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 15 ways as a sum of consecutive naturals, for example, 6601 + ... + 7692.

It is an arithmetic number, because the mean of its divisors is an integer number (600348).

Almost surely, 2^7803978 is an apocalyptic number.

7803978 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

7803978 is an abundant number, since it is smaller than the sum of its proper divisors (11407158).

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

7803978 is a wasteful number, since it uses less digits than its factorization.

7803978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14318.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 7803978 is about 2793.5600942167. The cubic root of 7803978 is about 198.3529568105.

The spelling of 7803978 in words is "seven million, eight hundred three thousand, nine hundred seventy-eight".