40288139 has 2 divisors, whose sum is σ = 40288140. Its totient is φ = 40288138.

The previous prime is 40288099. The next prime is 40288217. The reversal of 40288139 is 93188204.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40288139 - 2¹⁶ = 40222603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40288099 and 40288108.

It is not a weakly prime, because it can be changed into another prime (40288439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20144069 + 20144070.

It is an arithmetic number, because the mean of its divisors is an integer number (20144070).

Almost surely, 2^40288139 is an apocalyptic number.

40288139 is a deficient number, since it is larger than the sum of its proper divisors (1).

40288139 is an equidigital number, since it uses as much as digits as its factorization.

40288139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 40288139 is about 6347.2938328078. The cubic root of 40288139 is about 342.8144099932.

It can be divided in two parts, 4028 and 8139, that added together give a cube (12167 = 23³).

The spelling of 40288139 in words is "forty million, two hundred eighty-eight thousand, one hundred thirty-nine".