6401929 has 2 divisors, whose sum is σ = 6401930. Its totient is φ = 6401928.

The previous prime is 6401921. The next prime is 6401933. The reversal of 6401929 is 9291046.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6350400 + 51529 = 2520^2 + 227^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401929 - 2³ = 6401921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6401929.

It is not a weakly prime, because it can be changed into another prime (6401921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200964 + 3200965.

It is an arithmetic number, because the mean of its divisors is an integer number (3200965).

Almost surely, 2^6401929 is an apocalyptic number.

It is an amenable number.

6401929 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401929 is an equidigital number, since it uses as much as digits as its factorization.

6401929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 6401929 is about 2530.2033515115. The cubic root of 6401929 is about 185.6822048559.

The spelling of 6401929 in words is "six million, four hundred one thousand, nine hundred twenty-nine".