39009994 has 4 divisors (see below), whose sum is σ = 58514994. Its totient is φ = 19504996.

The previous prime is 39009991. The next prime is 39010003. The reversal of 39009994 is 49990093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49990093 = 47 ⋅1063619.

It can be written as a sum of positive squares in only one way, i.e., 38278969 + 731025 = 6187^2 + 855^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 39009994.

It is not an unprimeable number, because it can be changed into a prime (39009991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9752497 + ... + 9752500.

Almost surely, 2^39009994 is an apocalyptic number.

39009994 is a deficient number, since it is larger than the sum of its proper divisors (19505000).

39009994 is a wasteful number, since it uses less digits than its factorization.

39009994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19504999.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 39009994 is about 6245.7981075280. The cubic root of 39009994 is about 339.1501091498.

The spelling of 39009994 in words is "thirty-nine million, nine thousand, nine hundred ninety-four".