400679 has 2 divisors, whose sum is σ = 400680. Its totient is φ = 400678.

The previous prime is 400657. The next prime is 400681. The reversal of 400679 is 976004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400679 is a prime.

It is a super-2 number, since 2×400679² = 321087322082, which contains 22 as substring.

Together with 400681, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200339 + 200340.

It is an arithmetic number, because the mean of its divisors is an integer number (200340).

2⁴⁰⁰⁶⁷⁹ is an apocalyptic number.

400679 is a deficient number, since it is larger than the sum of its proper divisors (1).

400679 is an equidigital number, since it uses as much as digits as its factorization.

400679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 400679 is about 632.9921010566. The cubic root of 400679 is about 73.7222973614.

The spelling of 400679 in words is "four hundred thousand, six hundred seventy-nine".