4007978 has 8 divisors (see below), whose sum is σ = 6474468. Its totient is φ = 1849824.

The previous prime is 4007963. The next prime is 4007981. The reversal of 4007978 is 8797004.

It can be written as a sum of positive squares in 2 ways, for example, as 3508129 + 499849 = 1873^2 + 707^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77051 + ... + 77102.

Almost surely, 2^4007978 is an apocalyptic number.

4007978 is a deficient number, since it is larger than the sum of its proper divisors (2466490).

4007978 is a wasteful number, since it uses less digits than its factorization.

4007978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154168.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 4007978 is about 2001.9935064830. The cubic root of 4007978 is about 158.8455708241.

The spelling of 4007978 in words is "four million, seven thousand, nine hundred seventy-eight".