400740869 has 4 divisors (see below), whose sum is σ = 406722144. Its totient is φ = 394759596.

The previous prime is 400740859. The next prime is 400740877. The reversal of 400740869 is 968047004.

It is a happy number.

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 400740869 - 2²⁴ = 383963653 is a prime.

It is a super-2 number, since 2×400740869² = 321186488173750322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400740829) 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, 2990537 + ... + 2990670.

It is an arithmetic number, because the mean of its divisors is an integer number (101680536).

Almost surely, 2^400740869 is an apocalyptic number.

It is an amenable number.

400740869 is a deficient number, since it is larger than the sum of its proper divisors (5981275).

400740869 is an equidigital number, since it uses as much as digits as its factorization.

400740869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5981274.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 400740869 is about 20018.5131565758. The cubic root of 400740869 is about 737.2609166226.

The spelling of 400740869 in words is "four hundred million, seven hundred forty thousand, eight hundred sixty-nine".