4001123642 has 4 divisors (see below), whose sum is σ = 6001685466. Its totient is φ = 2000561820.

The previous prime is 4001123639. The next prime is 4001123657. The reversal of 4001123642 is 2463211004.

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., 2044034521 + 1957089121 = 45211^2 + 44239^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000280909 + ... + 1000280912.

Almost surely, 2^4001123642 is an apocalyptic number.

4001123642 is a deficient number, since it is larger than the sum of its proper divisors (2000561824).

4001123642 is a wasteful number, since it uses less digits than its factorization.

4001123642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000561823.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 4001123642 is about 63254.4357495978. The cubic root of 4001123642 is about 1587.5496772600.

Adding to 4001123642 its reverse (2463211004), we get a palindrome (6464334646).

The spelling of 4001123642 in words is "four billion, one million, one hundred twenty-three thousand, six hundred forty-two".