39890247 has 4 divisors (see below), whose sum is σ = 53187000. Its totient is φ = 26593496.

The previous prime is 39890231. The next prime is 39890251. The reversal of 39890247 is 74209893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74209893 = 3 ⋅24736631.

It is a cyclic number.

It is not a de Polignac number, because 39890247 - 2⁴ = 39890231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39890199 and 39890208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39890267) 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, 6648372 + ... + 6648377.

It is an arithmetic number, because the mean of its divisors is an integer number (13296750).

Almost surely, 2^39890247 is an apocalyptic number.

39890247 is a deficient number, since it is larger than the sum of its proper divisors (13296753).

39890247 is a wasteful number, since it uses less digits than its factorization.

39890247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13296752.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 39890247 is about 6315.8726237948. The cubic root of 39890247 is about 341.6821111665.

The spelling of 39890247 in words is "thirty-nine million, eight hundred ninety thousand, two hundred forty-seven".