40021459 has 2 divisors, whose sum is σ = 40021460. Its totient is φ = 40021458.

The previous prime is 40021427. The next prime is 40021463. The reversal of 40021459 is 95412004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40021459 - 2⁵ = 40021427 is a prime.

It is not a weakly prime, because it can be changed into another prime (40021409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010729 + 20010730.

It is an arithmetic number, because the mean of its divisors is an integer number (20010730).

Almost surely, 2^40021459 is an apocalyptic number.

40021459 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021459 is an equidigital number, since it uses as much as digits as its factorization.

40021459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 40021459 is about 6326.2515757753. The cubic root of 40021459 is about 342.0563356919.

The spelling of 40021459 in words is "forty million, twenty-one thousand, four hundred fifty-nine".