405726649 has 2 divisors, whose sum is σ = 405726650. Its totient is φ = 405726648.

The previous prime is 405726637. The next prime is 405726661. The reversal of 405726649 is 946627504.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (405726637) and next prime (405726661).

It can be written as a sum of positive squares in only one way, i.e., 394737424 + 10989225 = 19868^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 405726649 - 2²⁵ = 372172217 is a prime.

It is a super-2 number, since 2×405726649² = 329228227417538402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (405726619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202863324 + 202863325.

It is an arithmetic number, because the mean of its divisors is an integer number (202863325).

Almost surely, 2^405726649 is an apocalyptic number.

It is an amenable number.

405726649 is a deficient number, since it is larger than the sum of its proper divisors (1).

405726649 is an equidigital number, since it uses as much as digits as its factorization.

405726649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 405726649 is about 20142.6574463252. The cubic root of 405726649 is about 740.3058444794.

The spelling of 405726649 in words is "four hundred five million, seven hundred twenty-six thousand, six hundred forty-nine".