40642839 has 6 divisors (see below), whose sum is σ = 58706336. Its totient is φ = 27095220.

The previous prime is 40642837. The next prime is 40642841. The reversal of 40642839 is 93824604.

It is a happy number.

40642839 is a `hidden beast` number, since 4 + 0 + 642 + 8 + 3 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (40642837) and next prime (40642841).

It is not a de Polignac number, because 40642839 - 2¹ = 40642837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40642837) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2257927 + ... + 2257944.

Almost surely, 2^40642839 is an apocalyptic number.

40642839 is a deficient number, since it is larger than the sum of its proper divisors (18063497).

40642839 is a wasteful number, since it uses less digits than its factorization.

40642839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515877 (or 4515874 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 40642839 is about 6375.1736446939. The cubic root of 40642839 is about 343.8175270535.

It can be divided in two parts, 4064 and 2839, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 40642839 in words is "forty million, six hundred forty-two thousand, eight hundred thirty-nine".