400166769 has 4 divisors (see below), whose sum is σ = 533555696. Its totient is φ = 266777844.

The previous prime is 400166759. The next prime is 400166777. The reversal of 400166769 is 967661004.

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 not a de Polignac number, because 400166769 - 2⁹ = 400166257 is a prime.

It is a super-2 number, since 2×400166769² = 320266886023798722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400166759) 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, 66694459 + ... + 66694464.

It is an arithmetic number, because the mean of its divisors is an integer number (133388924).

Almost surely, 2^400166769 is an apocalyptic number.

It is an amenable number.

400166769 is a deficient number, since it is larger than the sum of its proper divisors (133388927).

400166769 is a wasteful number, since it uses less digits than its factorization.

400166769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133388926.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 400166769 is about 20004.1687905296. The cubic root of 400166769 is about 736.9086825423.

The spelling of 400166769 in words is "four hundred million, one hundred sixty-six thousand, seven hundred sixty-nine".