2040040402 has 4 divisors (see below), whose sum is σ = 3060060606. Its totient is φ = 1020020200.

The previous prime is 2040040391. The next prime is 2040040421. The reversal of 2040040402 is 2040400402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2040400402 = 2 ⋅1020200201.

It can be written as a sum of positive squares in only one way, i.e., 1972159281 + 67881121 = 44409^2 + 8239^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510010099 + ... + 510010102.

Almost surely, 2^2040040402 is an apocalyptic number.

2040040402 is a deficient number, since it is larger than the sum of its proper divisors (1020020204).

2040040402 is a wasteful number, since it uses less digits than its factorization.

2040040402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020020203.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 2040040402 is about 45166.8064179880. The cubic root of 2040040402 is about 1268.2735136440.

Adding to 2040040402 its reverse (2040400402), we get a palindrome (4080440804).

Subtracting 2040040402 from its reverse (2040400402), we obtain a square (360000 = 600²).

The spelling of 2040040402 in words is "two billion, forty million, forty thousand, four hundred two".