40028291 has 2 divisors, whose sum is σ = 40028292. Its totient is φ = 40028290.

The previous prime is 40028213. The next prime is 40028297. The reversal of 40028291 is 19282004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40028291 is a prime.

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 40028291.

It is not a weakly prime, because it can be changed into another prime (40028297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20014145 + 20014146.

It is an arithmetic number, because the mean of its divisors is an integer number (20014146).

Almost surely, 2^40028291 is an apocalyptic number.

40028291 is a deficient number, since it is larger than the sum of its proper divisors (1).

40028291 is an equidigital number, since it uses as much as digits as its factorization.

40028291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 40028291 is about 6326.7915249358. The cubic root of 40028291 is about 342.0757985499.

The spelling of 40028291 in words is "forty million, twenty-eight thousand, two hundred ninety-one".