40780138 has 16 divisors (see below), whose sum is σ = 70303680. Its totient is φ = 17378496.

The previous prime is 40780133. The next prime is 40780171. The reversal of 40780138 is 83108704.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (40780133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5631 + ... + 10642.

It is an arithmetic number, because the mean of its divisors is an integer number (4393980).

Almost surely, 2^40780138 is an apocalyptic number.

40780138 is a deficient number, since it is larger than the sum of its proper divisors (29523542).

40780138 is a wasteful number, since it uses less digits than its factorization.

40780138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16461.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 40780138 is about 6385.9328214443. The cubic root of 40780138 is about 344.2042515599.

The spelling of 40780138 in words is "forty million, seven hundred eighty thousand, one hundred thirty-eight".