400420394 has 8 divisors (see below), whose sum is σ = 655233408. Its totient is φ = 182009260.

The previous prime is 400420387. The next prime is 400420399. The reversal of 400420394 is 493024004.

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

It is a super-2 number, since 2×400420394² = 320672983862230472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400420399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9100442 + ... + 9100485.

It is an arithmetic number, because the mean of its divisors is an integer number (81904176).

Almost surely, 2^400420394 is an apocalyptic number.

400420394 is a deficient number, since it is larger than the sum of its proper divisors (254813014).

400420394 is a wasteful number, since it uses less digits than its factorization.

400420394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18200940.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 400420394 is about 20010.5070900265. The cubic root of 400420394 is about 737.0643334756.

Adding to 400420394 its reverse (493024004), we get a palindrome (893444398).

The spelling of 400420394 in words is "four hundred million, four hundred twenty thousand, three hundred ninety-four".