40203978 has 32 divisors (see below), whose sum is σ = 83477184. Its totient is φ = 12897792.

The previous prime is 40203973. The next prime is 40203979. The reversal of 40203978 is 87930204.

It is not an unprimeable number, because it can be changed into a prime (40203971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20601 + ... + 22467.

It is an arithmetic number, because the mean of its divisors is an integer number (2608662).

Almost surely, 2^40203978 is an apocalyptic number.

40203978 is an abundant number, since it is smaller than the sum of its proper divisors (43273206).

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

40203978 is a wasteful number, since it uses less digits than its factorization.

40203978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 40203978 is about 6340.6606911268. The cubic root of 40203978 is about 342.5755330951.

The spelling of 40203978 in words is "forty million, two hundred three thousand, nine hundred seventy-eight".