401940642 has 16 divisors (see below), whose sum is σ = 808048800. Its totient is φ = 133285632.

The previous prime is 401940631. The next prime is 401940647. The reversal of 401940642 is 246049104.

It is not an unprimeable number, because it can be changed into a prime (401940647) 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, 172392 + ... + 174707.

It is an arithmetic number, because the mean of its divisors is an integer number (50503050).

Almost surely, 2^401940642 is an apocalyptic number.

401940642 is an abundant number, since it is smaller than the sum of its proper divisors (406108158).

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

401940642 is a wasteful number, since it uses less digits than its factorization.

401940642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347297.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 401940642 is about 20048.4573471377. The cubic root of 401940642 is about 737.9959422813.

Adding to 401940642 its reverse (246049104), we get a palindrome (647989746).

The spelling of 401940642 in words is "four hundred one million, nine hundred forty thousand, six hundred forty-two".