400779 has 6 divisors (see below), whose sum is σ = 578916. Its totient is φ = 267180.

The previous prime is 400759. The next prime is 400823. The reversal of 400779 is 977004.

It is not a de Polignac number, because 400779 - 2⁷ = 400651 is a prime.

400779 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (400739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22257 + ... + 22274.

It is an arithmetic number, because the mean of its divisors is an integer number (96486).

2⁴⁰⁰⁷⁷⁹ is an apocalyptic number.

400779 is a deficient number, since it is larger than the sum of its proper divisors (178137).

400779 is a wasteful number, since it uses less digits than its factorization.

400779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44537 (or 44534 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 400779 is about 633.0710860559. The cubic root of 400779 is about 73.7284299650.

The spelling of 400779 in words is "four hundred thousand, seven hundred seventy-nine".