40401320402 has 4 divisors (see below), whose sum is σ = 60601980606. Its totient is φ = 20200660200.

The previous prime is 40401320383. The next prime is 40401320411. The reversal of 40401320402 is 20402310404.

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., 40393362361 + 7958041 = 200981^2 + 2821^2 .

It is a super-2 number, since 2×40401320402² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100330099 + ... + 10100330102.

Almost surely, 2^40401320402 is an apocalyptic number.

40401320402 is a deficient number, since it is larger than the sum of its proper divisors (20200660204).

40401320402 is a wasteful number, since it uses less digits than its factorization.

40401320402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20200660203.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 40401320402 its reverse (20402310404), we get a palindrome (60803630806).

The spelling of 40401320402 in words is "forty billion, four hundred one million, three hundred twenty thousand, four hundred two".