40021427 has 2 divisors, whose sum is σ = 40021428. Its totient is φ = 40021426.

The previous prime is 40021409. The next prime is 40021459. The reversal of 40021427 is 72412004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40021427 - 2⁸ = 40021171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40021399 and 40021408.

It is not a weakly prime, because it can be changed into another prime (40021477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010713 + 20010714.

It is an arithmetic number, because the mean of its divisors is an integer number (20010714).

Almost surely, 2^40021427 is an apocalyptic number.

40021427 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021427 is an equidigital number, since it uses as much as digits as its factorization.

40021427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 40021427 is about 6326.2490466310. The cubic root of 40021427 is about 342.0562445257.

The spelling of 40021427 in words is "forty million, twenty-one thousand, four hundred twenty-seven".