405342557 has 2 divisors, whose sum is σ = 405342558. Its totient is φ = 405342556.

The previous prime is 405342527. The next prime is 405342571. The reversal of 405342557 is 755243504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402363481 + 2979076 = 20059^2 + 1726^2 .

It is a cyclic number.

It is not a de Polignac number, because 405342557 - 2¹⁰ = 405341533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405342517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202671278 + 202671279.

It is an arithmetic number, because the mean of its divisors is an integer number (202671279).

Almost surely, 2^405342557 is an apocalyptic number.

It is an amenable number.

405342557 is a deficient number, since it is larger than the sum of its proper divisors (1).

405342557 is an equidigital number, since it uses as much as digits as its factorization.

405342557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84000, while the sum is 35.

The square root of 405342557 is about 20133.1208956783. The cubic root of 405342557 is about 740.0721606037.

The spelling of 405342557 in words is "four hundred five million, three hundred forty-two thousand, five hundred fifty-seven".