40154242 has 4 divisors (see below), whose sum is σ = 60231366. Its totient is φ = 20077120.

The previous prime is 40154203. The next prime is 40154243. The reversal of 40154242 is 24245104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 35748441 + 4405801 = 5979^2 + 2099^2 .

It is a super-2 number, since 2×40154242² = 3224726301189128, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a pancake number, because a pancake can be divided into 40154242 parts by 8961 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (40154243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10038559 + ... + 10038562.

Almost surely, 2^40154242 is an apocalyptic number.

40154242 is a deficient number, since it is larger than the sum of its proper divisors (20077124).

40154242 is a wasteful number, since it uses less digits than its factorization.

40154242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20077123.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 40154242 is about 6336.7374886451. The cubic root of 40154242 is about 342.4342090406.

Adding to 40154242 its reverse (24245104), we get a palindrome (64399346).

The spelling of 40154242 in words is "forty million, one hundred fifty-four thousand, two hundred forty-two".