40157569 has 3 divisors (see below), whose sum is σ = 40163907. Its totient is φ = 40151232.

The previous prime is 40157567. The next prime is 40157591. The reversal of 40157569 is 96575104.

The square root of 40157569 is 6337.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 26132544 = 3745^2 + 5112^2 .

It is not a de Polignac number, because 40157569 - 2¹ = 40157567 is a prime.

It is a super-2 number, since 2×40157569² = 3225260695979522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40157567) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3169 + ... + 9505.

It is an arithmetic number, because the mean of its divisors is an integer number (13387969).

Almost surely, 2^40157569 is an apocalyptic number.

40157569 is the 6337-th square number.

40157569 is the 3169-th centered octagonal number.

It is an amenable number.

40157569 is a deficient number, since it is larger than the sum of its proper divisors (6338).

40157569 is an frugal number, since it uses more digits than its factorization.

40157569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12674 (or 6337 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The cubic root of 40157569 is about 342.4436662992.

It can be divided in two parts, 401 and 57569, that added together give a triangular number (57970 = T₃₄₀).

The spelling of 40157569 in words is "forty million, one hundred fifty-seven thousand, five hundred sixty-nine".