39540247 has 4 divisors (see below), whose sum is σ = 39747456. Its totient is φ = 39333040.

The previous prime is 39540239. The next prime is 39540269. The reversal of 39540247 is 74204593.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74204593 = 4457 ⋅16649.

It is a cyclic number.

It is not a de Polignac number, because 39540247 - 2³ = 39540239 is a prime.

It is a super-2 number, since 2×39540247² = 3126862265642018, 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 (39540217) 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, 103318 + ... + 103699.

It is an arithmetic number, because the mean of its divisors is an integer number (9936864).

Almost surely, 2^39540247 is an apocalyptic number.

39540247 is a deficient number, since it is larger than the sum of its proper divisors (207209).

39540247 is a wasteful number, since it uses less digits than its factorization.

39540247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207208.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 39540247 is about 6288.1036091973. The cubic root of 39540247 is about 340.6798593795.

The spelling of 39540247 in words is "thirty-nine million, five hundred forty thousand, two hundred forty-seven".