400142101 has 4 divisors (see below), whose sum is σ = 400357612. Its totient is φ = 399926592.

The previous prime is 400142081. The next prime is 400142143. The reversal of 400142101 is 101241004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97416900 + 302725201 = 9870^2 + 17399^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400142101 is a prime.

It is a super-2 number, since 2×400142101² = 320227401985388402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400142191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104946 + ... + 108691.

It is an arithmetic number, because the mean of its divisors is an integer number (100089403).

Almost surely, 2^400142101 is an apocalyptic number.

It is an amenable number.

400142101 is a deficient number, since it is larger than the sum of its proper divisors (215511).

400142101 is a wasteful number, since it uses less digits than its factorization.

400142101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215510.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 400142101 is about 20003.5522095452. The cubic root of 400142101 is about 736.8935401581.

Adding to 400142101 its reverse (101241004), we get a palindrome (501383105).

The spelling of 400142101 in words is "four hundred million, one hundred forty-two thousand, one hundred one".