400220670 has 16 divisors (see below), whose sum is σ = 960529680. Its totient is φ = 106725504.

The previous prime is 400220663. The next prime is 400220671. The reversal of 400220670 is 76022004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400220671) 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, 6670315 + ... + 6670374.

It is an arithmetic number, because the mean of its divisors is an integer number (60033105).

Almost surely, 2^400220670 is an apocalyptic number.

400220670 is an abundant number, since it is smaller than the sum of its proper divisors (560309010).

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

400220670 is a wasteful number, since it uses less digits than its factorization.

400220670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13340699.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 400220670 is about 20005.5159893465. The cubic root of 400220670 is about 736.9417673582.

Adding to 400220670 its reverse (76022004), we get a palindrome (476242674).

The spelling of 400220670 in words is "four hundred million, two hundred twenty thousand, six hundred seventy".