4000420397 has 2 divisors, whose sum is σ = 4000420398. Its totient is φ = 4000420396.

The previous prime is 4000420393. The next prime is 4000420439. The reversal of 4000420397 is 7930240004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3907375081 + 93045316 = 62509^2 + 9646^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000420397 - 2² = 4000420393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000420393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000210198 + 2000210199.

It is an arithmetic number, because the mean of its divisors is an integer number (2000210199).

Almost surely, 2^4000420397 is an apocalyptic number.

It is an amenable number.

4000420397 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000420397 is an equidigital number, since it uses as much as digits as its factorization.

4000420397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 4000420397 is about 63248.8766461508. The cubic root of 4000420397 is about 1587.4566615734.

The spelling of 4000420397 in words is "four billion, four hundred twenty thousand, three hundred ninety-seven".