400066738 has 8 divisors (see below), whose sum is σ = 626191488. Its totient is φ = 191336244.

The previous prime is 400066697. The next prime is 400066739. The reversal of 400066738 is 837660004.

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

It is not an unprimeable number, because it can be changed into a prime (400066739) 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, 4348506 + ... + 4348597.

It is an arithmetic number, because the mean of its divisors is an integer number (78273936).

Almost surely, 2^400066738 is an apocalyptic number.

400066738 is a deficient number, since it is larger than the sum of its proper divisors (226124750).

400066738 is a wasteful number, since it uses less digits than its factorization.

400066738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8697128.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 400066738 is about 20001.6683804127. The cubic root of 400066738 is about 736.8472749317.

The spelling of 400066738 in words is "four hundred million, sixty-six thousand, seven hundred thirty-eight".