400108909 has 8 divisors (see below), whose sum is σ = 414196992. Its totient is φ = 386094720.

The previous prime is 400108871. The next prime is 400108921. The reversal of 400108909 is 909801004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400108909 - 2⁷ = 400108781 is a prime.

It is a super-2 number, since 2×400108909² = 320174278122340562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400108939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7339 + ... + 29224.

It is an arithmetic number, because the mean of its divisors is an integer number (51774624).

Almost surely, 2^400108909 is an apocalyptic number.

It is an amenable number.

400108909 is a deficient number, since it is larger than the sum of its proper divisors (14088083).

400108909 is a wasteful number, since it uses less digits than its factorization.

400108909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36947.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 400108909 is about 20002.7225396944. The cubic root of 400108909 is about 736.8731643577.

The spelling of 400108909 in words is "four hundred million, one hundred eight thousand, nine hundred nine".