402444649 has 2 divisors, whose sum is σ = 402444650. Its totient is φ = 402444648.

The previous prime is 402444607. The next prime is 402444659. The reversal of 402444649 is 946444204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379977049 + 22467600 = 19493^2 + 4740^2 .

It is a cyclic number.

It is not a de Polignac number, because 402444649 - 2⁷ = 402444521 is a prime.

It is not a weakly prime, because it can be changed into another prime (402444659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201222324 + 201222325.

It is an arithmetic number, because the mean of its divisors is an integer number (201222325).

Almost surely, 2^402444649 is an apocalyptic number.

It is an amenable number.

402444649 is a deficient number, since it is larger than the sum of its proper divisors (1).

402444649 is an equidigital number, since it uses as much as digits as its factorization.

402444649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 37.

The square root of 402444649 is about 20061.0231294418. The cubic root of 402444649 is about 738.3042794843.

The spelling of 402444649 in words is "four hundred two million, four hundred forty-four thousand, six hundred forty-nine".