400209474 has 16 divisors (see below), whose sum is σ = 914764608. Its totient is φ = 114345552.

The previous prime is 400209457. The next prime is 400209479. The reversal of 400209474 is 474902004.

It is not an unprimeable number, because it can be changed into a prime (400209479) 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, 4764357 + ... + 4764440.

It is an arithmetic number, because the mean of its divisors is an integer number (57172788).

Almost surely, 2^400209474 is an apocalyptic number.

400209474 is an abundant number, since it is smaller than the sum of its proper divisors (514555134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400209474 is a wasteful number, since it uses less digits than its factorization.

400209474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9528809.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 400209474 is about 20005.2361645645. The cubic root of 400209474 is about 736.9348954185.

It can be divided in two parts, 40020 and 9474, that added together give a palindrome (49494).

The spelling of 400209474 in words is "four hundred million, two hundred nine thousand, four hundred seventy-four".