400685867 has 4 divisors (see below), whose sum is σ = 405757920. Its totient is φ = 395613816.

The previous prime is 400685863. The next prime is 400685891. The reversal of 400685867 is 768586004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400685867 - 2² = 400685863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400685863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2535908 + ... + 2536065.

It is an arithmetic number, because the mean of its divisors is an integer number (101439480).

Almost surely, 2^400685867 is an apocalyptic number.

400685867 is a deficient number, since it is larger than the sum of its proper divisors (5072053).

400685867 is an equidigital number, since it uses as much as digits as its factorization.

400685867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5072052.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 400685867 is about 20017.1393310833. The cubic root of 400685867 is about 737.2271851988.

The spelling of 400685867 in words is "four hundred million, six hundred eighty-five thousand, eight hundred sixty-seven".