400400402 has 8 divisors (see below), whose sum is σ = 619974912. Its totient is φ = 193742100.

The previous prime is 400400389. The next prime is 400400437. The reversal of 400400402 is 204004004.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3228974 + ... + 3229097.

It is an arithmetic number, because the mean of its divisors is an integer number (77496864).

Almost surely, 2^400400402 is an apocalyptic number.

400400402 is a deficient number, since it is larger than the sum of its proper divisors (219574510).

400400402 is a wasteful number, since it uses less digits than its factorization.

400400402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458104.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 400400402 is about 20010.0075462255. The cubic root of 400400402 is about 737.0520666717.

Adding to 400400402 its reverse (204004004), we get a palindrome (604404406).

The spelling of 400400402 in words is "four hundred million, four hundred thousand, four hundred two".