400003569 has 32 divisors (see below), whose sum is σ = 678205440. Its totient is φ = 228252816.

The previous prime is 400003553. The next prime is 400003579. The reversal of 400003569 is 965300004.

It is a happy number.

It is not a de Polignac number, because 400003569 - 2⁴ = 400003553 is a prime.

It is a super-2 number, since 2×400003569² = 320005710425475522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (400003529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223452 + ... + 225234.

It is an arithmetic number, because the mean of its divisors is an integer number (21193920).

Almost surely, 2^400003569 is an apocalyptic number.

It is an amenable number.

400003569 is a deficient number, since it is larger than the sum of its proper divisors (278201871).

400003569 is a wasteful number, since it uses less digits than its factorization.

400003569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986 (or 2980 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 400003569 is about 20000.0892248010. The cubic root of 400003569 is about 736.8084911063.

The spelling of 400003569 in words is "four hundred million, three thousand, five hundred sixty-nine".