402361649 has 2 divisors, whose sum is σ = 402361650. Its totient is φ = 402361648.

The previous prime is 402361639. The next prime is 402361657. The reversal of 402361649 is 946163204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402283249 + 78400 = 20057^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 402361649 - 2⁴ = 402361633 is a prime.

It is equal to p_21455396 and since 402361649 and 21455396 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (402361639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201180824 + 201180825.

It is an arithmetic number, because the mean of its divisors is an integer number (201180825).

Almost surely, 2^402361649 is an apocalyptic number.

It is an amenable number.

402361649 is a deficient number, since it is larger than the sum of its proper divisors (1).

402361649 is an equidigital number, since it uses as much as digits as its factorization.

402361649 is an evil number, because the sum of its binary digits is even.

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

The square root of 402361649 is about 20058.9543346606. The cubic root of 402361649 is about 738.2535201492.

The spelling of 402361649 in words is "four hundred two million, three hundred sixty-one thousand, six hundred forty-nine".