400018429 has 2 divisors, whose sum is σ = 400018430. Its totient is φ = 400018428.

The previous prime is 400018403. The next prime is 400018439. The reversal of 400018429 is 924810004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354455929 + 45562500 = 18827^2 + 6750^2 .

It is a cyclic number.

It is not a de Polignac number, because 400018429 - 2⁷ = 400018301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400018397 and 400018406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400018439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200009214 + 200009215.

It is an arithmetic number, because the mean of its divisors is an integer number (200009215).

Almost surely, 2^400018429 is an apocalyptic number.

It is an amenable number.

400018429 is a deficient number, since it is larger than the sum of its proper divisors (1).

400018429 is an equidigital number, since it uses as much as digits as its factorization.

400018429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 400018429 is about 20000.4607196934. The cubic root of 400018429 is about 736.8176150571.

The spelling of 400018429 in words is "four hundred million, eighteen thousand, four hundred twenty-nine".