400040429 has 2 divisors, whose sum is σ = 400040430. Its totient is φ = 400040428.

The previous prime is 400040423. The next prime is 400040441. The reversal of 400040429 is 924040004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216031204 + 184009225 = 14698^2 + 13565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400040429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400040423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200020214 + 200020215.

It is an arithmetic number, because the mean of its divisors is an integer number (200020215).

Almost surely, 2^400040429 is an apocalyptic number.

It is an amenable number.

400040429 is a deficient number, since it is larger than the sum of its proper divisors (1).

400040429 is an equidigital number, since it uses as much as digits as its factorization.

400040429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 400040429 is about 20001.0106994622. The cubic root of 400040429 is about 736.8311225100.

The spelling of 400040429 in words is "four hundred million, forty thousand, four hundred twenty-nine".