400394177 has 4 divisors (see below), whose sum is σ = 402158256. Its totient is φ = 398630100.

The previous prime is 400394173. The next prime is 400394207. The reversal of 400394177 is 771493004.

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 400394177 - 2² = 400394173 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400394173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881699 + ... + 882152.

It is an arithmetic number, because the mean of its divisors is an integer number (100539564).

Almost surely, 2^400394177 is an apocalyptic number.

It is an amenable number.

400394177 is a deficient number, since it is larger than the sum of its proper divisors (1764079).

400394177 is a wasteful number, since it uses less digits than its factorization.

400394177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764078.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 400394177 is about 20009.8519984532. The cubic root of 400394177 is about 737.0482470178.

The spelling of 400394177 in words is "four hundred million, three hundred ninety-four thousand, one hundred seventy-seven".