405680377 has 4 divisors (see below), whose sum is σ = 411735376. Its totient is φ = 399625380.

The previous prime is 405680369. The next prime is 405680383. The reversal of 405680377 is 773086504.

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 405680377 - 2³ = 405680369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405686377) 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, 3027399 + ... + 3027532.

It is an arithmetic number, because the mean of its divisors is an integer number (102933844).

Almost surely, 2^405680377 is an apocalyptic number.

It is an amenable number.

405680377 is a deficient number, since it is larger than the sum of its proper divisors (6054999).

405680377 is an equidigital number, since it uses as much as digits as its factorization.

405680377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6054998.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 405680377 is about 20141.5088064425. The cubic root of 405680377 is about 740.2777001327.

The spelling of 405680377 in words is "four hundred five million, six hundred eighty thousand, three hundred seventy-seven".