402439049 has 2 divisors, whose sum is σ = 402439050. Its totient is φ = 402439048.

The previous prime is 402439039. The next prime is 402439069. The reversal of 402439049 is 940934204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396288649 + 6150400 = 19907^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 402439049 - 2⁴ = 402439033 is a prime.

It is not a weakly prime, because it can be changed into another prime (402439039) 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, 201219524 + 201219525.

It is an arithmetic number, because the mean of its divisors is an integer number (201219525).

Almost surely, 2^402439049 is an apocalyptic number.

It is an amenable number.

402439049 is a deficient number, since it is larger than the sum of its proper divisors (1).

402439049 is an equidigital number, since it uses as much as digits as its factorization.

402439049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 402439049 is about 20060.8835548188. The cubic root of 402439049 is about 738.3008549777.

The spelling of 402439049 in words is "four hundred two million, four hundred thirty-nine thousand, forty-nine".