406667557 has 4 divisors (see below), whose sum is σ = 430589196. Its totient is φ = 382745920.

The previous prime is 406667537. The next prime is 406667567. The reversal of 406667557 is 755766604.

It is a Cunningham number, because it is equal to 20166²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 316626436 + 90041121 = 17794^2 + 9489^2 .

It is a cyclic number.

It is not a de Polignac number, because 406667557 - 2²³ = 398278949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406667537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11960794 + ... + 11960827.

It is an arithmetic number, because the mean of its divisors is an integer number (107647299).

Almost surely, 2^406667557 is an apocalyptic number.

It is an amenable number.

406667557 is a deficient number, since it is larger than the sum of its proper divisors (23921639).

406667557 is a wasteful number, since it uses less digits than its factorization.

406667557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23921638.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The square root of 406667557 is about 20166.0000247942. Note that the first 4 decimals coincide. The cubic root of 406667557 is about 740.8776760555.

The spelling of 406667557 in words is "four hundred six million, six hundred sixty-seven thousand, five hundred fifty-seven".