400218967 has 4 divisors (see below), whose sum is σ = 400814320. Its totient is φ = 399623616.

The previous prime is 400218919. The next prime is 400218989. The reversal of 400218967 is 769812004.

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 400218967 - 2¹¹ = 400216919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400218367) 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, 296667 + ... + 298012.

It is an arithmetic number, because the mean of its divisors is an integer number (100203580).

Almost surely, 2^400218967 is an apocalyptic number.

400218967 is a deficient number, since it is larger than the sum of its proper divisors (595353).

400218967 is an equidigital number, since it uses as much as digits as its factorization.

400218967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595352.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 400218967 is about 20005.4734260402. The cubic root of 400218967 is about 736.9407220902.

The spelling of 400218967 in words is "four hundred million, two hundred eighteen thousand, nine hundred sixty-seven".