400256029 has 2 divisors, whose sum is σ = 400256030. Its totient is φ = 400256028.

The previous prime is 400256027. The next prime is 400256093. The reversal of 400256029 is 920652004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330148900 + 70107129 = 18170^2 + 8373^2 .

It is a cyclic number.

It is not a de Polignac number, because 400256029 - 2¹ = 400256027 is a prime.

Together with 400256027, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 400255988 and 400256006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400256027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200128014 + 200128015.

It is an arithmetic number, because the mean of its divisors is an integer number (200128015).

Almost surely, 2^400256029 is an apocalyptic number.

It is an amenable number.

400256029 is a deficient number, since it is larger than the sum of its proper divisors (1).

400256029 is an equidigital number, since it uses as much as digits as its factorization.

400256029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 400256029 is about 20006.3997010956. The cubic root of 400256029 is about 736.9634693496.

It can be divided in two parts, 4002 and 56029, that added together give a triangular number (60031 = T₃₄₆).

The spelling of 400256029 in words is "four hundred million, two hundred fifty-six thousand, twenty-nine".