39987743 has 4 divisors (see below), whose sum is σ = 40242600. Its totient is φ = 39732888.

The previous prime is 39987733. The next prime is 39987763. The reversal of 39987743 is 34778993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39987743 is a prime.

It is a super-3 number, since 3×39987743³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39987691 and 39987700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39987733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127193 + ... + 127506.

It is an arithmetic number, because the mean of its divisors is an integer number (10060650).

Almost surely, 2^39987743 is an apocalyptic number.

39987743 is a deficient number, since it is larger than the sum of its proper divisors (254857).

39987743 is a wasteful number, since it uses less digits than its factorization.

39987743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254856.

The product of its digits is 1143072, while the sum is 50.

The square root of 39987743 is about 6323.5862451618. The cubic root of 39987743 is about 341.9602538081.

The spelling of 39987743 in words is "thirty-nine million, nine hundred eighty-seven thousand, seven hundred forty-three".