405764423657 has 4 divisors (see below), whose sum is σ = 405874899540. Its totient is φ = 405653947776.

The previous prime is 405764423621. The next prime is 405764423677. The reversal of 405764423657 is 756324467504.

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 232898899216 + 172865524441 = 482596^2 + 415771^2 .

It is a cyclic number.

It is not a de Polignac number, because 405764423657 - 2¹² = 405764419561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405764423599 and 405764423608.

It is not an unprimeable number, because it can be changed into a prime (405764423677) 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, 55232432 + ... + 55239777.

It is an arithmetic number, because the mean of its divisors is an integer number (101468724885).

Almost surely, 2^405764423657 is an apocalyptic number.

It is an amenable number.

405764423657 is a deficient number, since it is larger than the sum of its proper divisors (110475883).

405764423657 is a wasteful number, since it uses less digits than its factorization.

405764423657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110475882.

The product of its (nonzero) digits is 16934400, while the sum is 53.

The spelling of 405764423657 in words is "four hundred five billion, seven hundred sixty-four million, four hundred twenty-three thousand, six hundred fifty-seven".