40393978 has 8 divisors (see below), whose sum is σ = 60634080. Its totient is φ = 20182620.

The previous prime is 40393967. The next prime is 40393987. The reversal of 40393978 is 87939304.

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

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, 3238 + ... + 9553.

It is an arithmetic number, because the mean of its divisors is an integer number (7579260).

Almost surely, 2^40393978 is an apocalyptic number.

40393978 is a deficient number, since it is larger than the sum of its proper divisors (20240102).

40393978 is a wasteful number, since it uses less digits than its factorization.

40393978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14372.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 40393978 is about 6355.6256969711. The cubic root of 40393978 is about 343.1143444899.

The spelling of 40393978 in words is "forty million, three hundred ninety-three thousand, nine hundred seventy-eight".