400403242 has 4 divisors (see below), whose sum is σ = 600604866. Its totient is φ = 200201620.

The previous prime is 400403231. The next prime is 400403243. The reversal of 400403242 is 242304004.

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

It can be written as a sum of positive squares in only one way, i.e., 393585921 + 6817321 = 19839^2 + 2611^2 .

It is a super-2 number, since 2×400403242² = 320645512408221128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400403243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100100809 + ... + 100100812.

Almost surely, 2^400403242 is an apocalyptic number.

400403242 is a deficient number, since it is larger than the sum of its proper divisors (200201624).

400403242 is a wasteful number, since it uses less digits than its factorization.

400403242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200201623.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 400403242 is about 20010.0785105906. The cubic root of 400403242 is about 737.0538092798.

Adding to 400403242 its reverse (242304004), we get a palindrome (642707246).

The spelling of 400403242 in words is "four hundred million, four hundred three thousand, two hundred forty-two".