408387779817 has 4 divisors (see below), whose sum is σ = 544517039760. Its totient is φ = 272258519876.

The previous prime is 408387779801. The next prime is 408387779869. The reversal of 408387779817 is 718977783804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 408387779817 - 2⁴ = 408387779801 is a prime.

It is a super-3 number, since 3×408387779817³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (408387779717) 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, 68064629967 + ... + 68064629972.

It is an arithmetic number, because the mean of its divisors is an integer number (136129259940).

Almost surely, 2^408387779817 is an apocalyptic number.

It is an amenable number.

408387779817 is a deficient number, since it is larger than the sum of its proper divisors (136129259943).

408387779817 is a wasteful number, since it uses less digits than its factorization.

408387779817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136129259942.

The product of its (nonzero) digits is 132765696, while the sum is 69.

The spelling of 408387779817 in words is "four hundred eight billion, three hundred eighty-seven million, seven hundred seventy-nine thousand, eight hundred seventeen".