400023402 has 16 divisors (see below), whose sum is σ = 804673440. Its totient is φ = 132570032.

The previous prime is 400023401. The next prime is 400023409. The reversal of 400023402 is 204320004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400023401) 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, 191652 + ... + 193727.

It is an arithmetic number, because the mean of its divisors is an integer number (50292090).

Almost surely, 2^400023402 is an apocalyptic number.

400023402 is an abundant number, since it is smaller than the sum of its proper divisors (404650038).

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

400023402 is a wasteful number, since it uses less digits than its factorization.

400023402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385557.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 400023402 is about 20000.5850414432. The cubic root of 400023402 is about 736.8206683987.

Adding to 400023402 its reverse (204320004), we get a palindrome (604343406).

The spelling of 400023402 in words is "four hundred million, twenty-three thousand, four hundred two".