538940691 has 6 divisors (see below), whose sum is σ = 778469900. Its totient is φ = 359293788.

The previous prime is 538940687. The next prime is 538940723. The reversal of 538940691 is 196049835.

It is a happy number.

It is not a de Polignac number, because 538940691 - 2² = 538940687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538944691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29941141 + ... + 29941158.

Almost surely, 2^538940691 is an apocalyptic number.

538940691 is a deficient number, since it is larger than the sum of its proper divisors (239529209).

538940691 is a wasteful number, since it uses less digits than its factorization.

538940691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59882305 (or 59882302 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 538940691 is about 23215.0961876103. The cubic root of 538940691 is about 813.7924536312.

The spelling of 538940691 in words is "five hundred thirty-eight million, nine hundred forty thousand, six hundred ninety-one".