40987779 has 16 divisors (see below), whose sum is σ = 62549760. Its totient is φ = 23387040.

The previous prime is 40987777. The next prime is 40987781. The reversal of 40987779 is 97778904.

It is an interprime number because it is at equal distance from previous prime (40987777) and next prime (40987781).

It is not a de Polignac number, because 40987779 - 2¹ = 40987777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40987777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22017 + ... + 23805.

It is an arithmetic number, because the mean of its divisors is an integer number (3909360).

Almost surely, 2^40987779 is an apocalyptic number.

40987779 is a deficient number, since it is larger than the sum of its proper divisors (21561981).

40987779 is a wasteful number, since it uses less digits than its factorization.

40987779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890.

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 40987779 is about 6402.1698665374. The cubic root of 40987779 is about 344.7874599321.

It can be divided in two parts, 409 and 87779, that added together give a palindrome (88188).

The spelling of 40987779 in words is "forty million, nine hundred eighty-seven thousand, seven hundred seventy-nine".