40421999 has 2 divisors, whose sum is σ = 40422000. Its totient is φ = 40421998.

The previous prime is 40421957. The next prime is 40422007. The reversal of 40421999 is 99912404.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40421999 - 2¹² = 40417903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40421929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20210999 + 20211000.

It is an arithmetic number, because the mean of its divisors is an integer number (20211000).

Almost surely, 2^40421999 is an apocalyptic number.

40421999 is a deficient number, since it is larger than the sum of its proper divisors (1).

40421999 is an equidigital number, since it uses as much as digits as its factorization.

40421999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 40421999 is about 6357.8297397776. The cubic root of 40421999 is about 343.1936647684.

The spelling of 40421999 in words is "forty million, four hundred twenty-one thousand, nine hundred ninety-nine".