400542 has 16 divisors (see below), whose sum is σ = 807312. Its totient is φ = 132480.

The previous prime is 400523. The next prime is 400559. The reversal of 400542 is 245004.

400542 is a modest number, since divided by 542 gives 4 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1308 + ... + 1584.

It is an arithmetic number, because the mean of its divisors is an integer number (50457).

2⁴⁰⁰⁵⁴² is an apocalyptic number.

400542 is an abundant number, since it is smaller than the sum of its proper divisors (406770).

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

400542 is a wasteful number, since it uses less digits than its factorization.

400542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 400542 is about 632.8838756044. The cubic root of 400542 is about 73.7138940376.

Adding to 400542 its reverse (245004), we get a palindrome (645546).

It can be divided in two parts, 40054 and 2, that multiplied together give a palindrome (80108).

The spelling of 400542 in words is "four hundred thousand, five hundred forty-two".