40156778 has 8 divisors (see below), whose sum is σ = 60262272. Its totient is φ = 20069356.

The previous prime is 40156777. The next prime is 40156783. The reversal of 40156778 is 87765104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×40156778² = 3225133638682568, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 5351 + ... + 10437.

It is an arithmetic number, because the mean of its divisors is an integer number (7532784).

Almost surely, 2^40156778 is an apocalyptic number.

40156778 is a deficient number, since it is larger than the sum of its proper divisors (20105494).

40156778 is a wasteful number, since it uses less digits than its factorization.

40156778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9036.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 40156778 is about 6336.9375884571. The cubic root of 40156778 is about 342.4414178669.

The spelling of 40156778 in words is "forty million, one hundred fifty-six thousand, seven hundred seventy-eight".