40156779 has 16 divisors (see below), whose sum is σ = 58205952. Its totient is φ = 24478368.

The previous prime is 40156777. The next prime is 40156783. The reversal of 40156779 is 97765104.

It is not a de Polignac number, because 40156779 - 2¹ = 40156777 is a prime.

It is a super-2 number, since 2×40156779² = 3225133799309682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (40156777) 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, 639 + ... + 8984.

It is an arithmetic number, because the mean of its divisors is an integer number (3637872).

Almost surely, 2^40156779 is an apocalyptic number.

40156779 is a deficient number, since it is larger than the sum of its proper divisors (18049173).

40156779 is a wasteful number, since it uses less digits than its factorization.

40156779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9746.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 40156779 is about 6336.9376673595. The cubic root of 40156779 is about 342.4414207095.

The spelling of 40156779 in words is "forty million, one hundred fifty-six thousand, seven hundred seventy-nine".