400670 has 16 divisors (see below), whose sum is σ = 730080. Its totient is φ = 158304.

The previous prime is 400657. The next prime is 400679. The reversal of 400670 is 76004.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400679) by changing a digit.

400670 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 836 + ... + 1224.

It is an arithmetic number, because the mean of its divisors is an integer number (45630).

2⁴⁰⁰⁶⁷⁰ is an apocalyptic number.

400670 is a deficient number, since it is larger than the sum of its proper divisors (329410).

400670 is a wasteful number, since it uses less digits than its factorization.

400670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 400670 is about 632.9849919232. The cubic root of 400670 is about 73.7217453770.

Adding to 400670 its reverse (76004), we get a palindrome (476674).

The spelling of 400670 in words is "four hundred thousand, six hundred seventy".