400078 has 24 divisors (see below), whose sum is σ = 744336. Its totient is φ = 157440.

The previous prime is 400069. The next prime is 400087. The reversal of 400078 is 870004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400069) and next prime (400087).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9738 + ... + 9778.

It is an arithmetic number, because the mean of its divisors is an integer number (31014).

2⁴⁰⁰⁰⁷⁸ is an apocalyptic number.

400078 is a deficient number, since it is larger than the sum of its proper divisors (344258).

400078 is a wasteful number, since it uses less digits than its factorization.

400078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 400078 is about 632.5171934422. The cubic root of 400078 is about 73.6854189025.

The spelling of 400078 in words is "four hundred thousand, seventy-eight".