400072869 has 24 divisors (see below), whose sum is σ = 661053120. Its totient is φ = 228400128.

The previous prime is 400072861. The next prime is 400072891. The reversal of 400072869 is 968270004.

It is not a de Polignac number, because 400072869 - 2³ = 400072861 is a prime.

It is a super-2 number, since 2×400072869² = 320116601019782322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400072861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86514 + ... + 91020.

It is an arithmetic number, because the mean of its divisors is an integer number (27543880).

Almost surely, 2^400072869 is an apocalyptic number.

It is an amenable number.

400072869 is a deficient number, since it is larger than the sum of its proper divisors (260980251).

400072869 is a wasteful number, since it uses less digits than its factorization.

400072869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5929 (or 5926 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 400072869 is about 20001.8216420405. The cubic root of 400072869 is about 736.8510389600.

The spelling of 400072869 in words is "four hundred million, seventy-two thousand, eight hundred sixty-nine".