39999893 has 4 divisors (see below), whose sum is σ = 40449420. Its totient is φ = 39550368.

The previous prime is 39999863. The next prime is 39999899. The reversal of 39999893 is 39899993.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5870929 + 34128964 = 2423^2 + 5842^2 .

It is a cyclic number.

It is not a de Polignac number, because 39999893 - 2¹⁶ = 39934357 is a prime.

It is a super-2 number, since 2×39999893² = 3199982880022898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39999899) 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, 224630 + ... + 224807.

It is an arithmetic number, because the mean of its divisors is an integer number (10112355).

Almost surely, 2^39999893 is an apocalyptic number.

It is an amenable number.

39999893 is a deficient number, since it is larger than the sum of its proper divisors (449527).

39999893 is an equidigital number, since it uses as much as digits as its factorization.

39999893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449526.

The product of its digits is 4251528, while the sum is 59.

The square root of 39999893 is about 6324.5468612384. The cubic root of 39999893 is about 341.9948843894.

The spelling of 39999893 in words is "thirty-nine million, nine hundred ninety-nine thousand, eight hundred ninety-three".