400221139 has 2 divisors, whose sum is σ = 400221140. Its totient is φ = 400221138.

The previous prime is 400221109. The next prime is 400221161. The reversal of 400221139 is 931122004.

It is an a-pointer prime, because the next prime (400221161) can be obtained adding 400221139 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400221139 - 2¹³ = 400212947 is a prime.

It is not a weakly prime, because it can be changed into another prime (400221109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200110569 + 200110570.

It is an arithmetic number, because the mean of its divisors is an integer number (200110570).

Almost surely, 2^400221139 is an apocalyptic number.

400221139 is a deficient number, since it is larger than the sum of its proper divisors (1).

400221139 is an equidigital number, since it uses as much as digits as its factorization.

400221139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 400221139 is about 20005.5277111102. The cubic root of 400221139 is about 736.9420552207.

The spelling of 400221139 in words is "four hundred million, two hundred twenty-one thousand, one hundred thirty-nine".