40042051 has 4 divisors (see below), whose sum is σ = 45762352. Its totient is φ = 34321752.

The previous prime is 40042043. The next prime is 40042099. The reversal of 40042051 is 15024004.

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

It is a cyclic number.

It is not a de Polignac number, because 40042051 - 2³ = 40042043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40042151) 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, 2860140 + ... + 2860153.

It is an arithmetic number, because the mean of its divisors is an integer number (11440588).

Almost surely, 2^40042051 is an apocalyptic number.

40042051 is a deficient number, since it is larger than the sum of its proper divisors (5720301).

40042051 is an equidigital number, since it uses as much as digits as its factorization.

40042051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5720300.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 40042051 is about 6327.8788705221. The cubic root of 40042051 is about 342.1149910279.

Adding to 40042051 its reverse (15024004), we get a palindrome (55066055).

The spelling of 40042051 in words is "forty million, forty-two thousand, fifty-one".