63440397 has 12 divisors (see below), whose sum is σ = 92797120. Its totient is φ = 41757768.

The previous prime is 63440389. The next prime is 63440401. The reversal of 63440397 is 79304436.

It is not a de Polignac number, because 63440397 - 2³ = 63440389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63440317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43903 + ... + 45324.

Almost surely, 2^63440397 is an apocalyptic number.

It is an amenable number.

63440397 is a deficient number, since it is larger than the sum of its proper divisors (29356723).

63440397 is a wasteful number, since it uses less digits than its factorization.

63440397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89312 (or 89309 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 63440397 is about 7964.9480224293. The cubic root of 63440397 is about 398.8307458589.

The spelling of 63440397 in words is "sixty-three million, four hundred forty thousand, three hundred ninety-seven".