400212142 has 16 divisors (see below), whose sum is σ = 656018352. Its totient is φ = 181601920.

The previous prime is 400212083. The next prime is 400212149. The reversal of 400212142 is 241212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400212149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2293 + ... + 28384.

It is an arithmetic number, because the mean of its divisors is an integer number (41001147).

Almost surely, 2^400212142 is an apocalyptic number.

400212142 is a deficient number, since it is larger than the sum of its proper divisors (255806210).

400212142 is a wasteful number, since it uses less digits than its factorization.

400212142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31283.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 400212142 is about 20005.3028469953. The cubic root of 400212142 is about 736.9365330092.

Adding to 400212142 its reverse (241212004), we get a palindrome (641424146).

The spelling of 400212142 in words is "four hundred million, two hundred twelve thousand, one hundred forty-two".