40784139 has 36 divisors (see below), whose sum is σ = 68592888. Its totient is φ = 23253120.

The previous prime is 40784123. The next prime is 40784141. The reversal of 40784139 is 93148704.

It is a happy number.

It is not a de Polignac number, because 40784139 - 2⁴ = 40784123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40789139) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17412 + ... + 19614.

It is an arithmetic number, because the mean of its divisors is an integer number (1905358).

Almost surely, 2^40784139 is an apocalyptic number.

40784139 is a deficient number, since it is larger than the sum of its proper divisors (27808749).

40784139 is a wasteful number, since it uses less digits than its factorization.

40784139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248 (or 2234 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 40784139 is about 6386.2460804451. The cubic root of 40784139 is about 344.2155079888.

The spelling of 40784139 in words is "forty million, seven hundred eighty-four thousand, one hundred thirty-nine".