400400734 has 4 divisors (see below), whose sum is σ = 600601104. Its totient is φ = 200200366.

The previous prime is 400400731. The next prime is 400400747. The reversal of 400400734 is 437004004.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400400731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100100182 + ... + 100100185.

It is an arithmetic number, because the mean of its divisors is an integer number (150150276).

Almost surely, 2^400400734 is an apocalyptic number.

400400734 is a deficient number, since it is larger than the sum of its proper divisors (200200370).

400400734 is a wasteful number, since it uses less digits than its factorization.

400400734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200200369.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 400400734 is about 20010.0158420727. The cubic root of 400400734 is about 737.0522703854.

Adding to 400400734 its reverse (437004004), we get a palindrome (837404738).

The spelling of 400400734 in words is "four hundred million, four hundred thousand, seven hundred thirty-four".