40078331 has 2 divisors, whose sum is σ = 40078332. Its totient is φ = 40078330.

The previous prime is 40078327. The next prime is 40078369. The reversal of 40078331 is 13387004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40078331 - 2² = 40078327 is a prime.

It is a super-2 number, since 2×40078331² = 3212545231491122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40078331.

It is not a weakly prime, because it can be changed into another prime (40078631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20039165 + 20039166.

It is an arithmetic number, because the mean of its divisors is an integer number (20039166).

Almost surely, 2^40078331 is an apocalyptic number.

40078331 is a deficient number, since it is larger than the sum of its proper divisors (1).

40078331 is an equidigital number, since it uses as much as digits as its factorization.

40078331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 40078331 is about 6330.7449008786. The cubic root of 40078331 is about 342.2182839816.

The spelling of 40078331 in words is "forty million, seventy-eight thousand, three hundred thirty-one".