40288429 has 2 divisors, whose sum is σ = 40288430. Its totient is φ = 40288428.

The previous prime is 40288403. The next prime is 40288439. The reversal of 40288429 is 92488204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38775529 + 1512900 = 6227^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 40288429 - 2⁵ = 40288397 is a prime.

It is a super-2 number, since 2×40288429² = 3246315022576082, which contains 22 as substring.

It is a congruent number.

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, 20144214 + 20144215.

It is an arithmetic number, because the mean of its divisors is an integer number (20144215).

Almost surely, 2^40288429 is an apocalyptic number.

It is an amenable number.

40288429 is a deficient number, since it is larger than the sum of its proper divisors (1).

40288429 is an equidigital number, since it uses as much as digits as its factorization.

40288429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 40288429 is about 6347.3166771479. The cubic root of 40288429 is about 342.8152325342.

It can be divided in two parts, 402 and 88429, that added together give a triangular number (88831 = T₄₂₁).

The spelling of 40288429 in words is "forty million, two hundred eighty-eight thousand, four hundred twenty-nine".