40142730 has 32 divisors (see below), whose sum is σ = 98164224. Its totient is φ = 10502336.

The previous prime is 40142717. The next prime is 40142749. The reversal of 40142730 is 3724104.

It is a super-2 number, since 2×40142730² = 3222877543705800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40142697 and 40142706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11034 + ... + 14213.

It is an arithmetic number, because the mean of its divisors is an integer number (3067632).

Almost surely, 2^40142730 is an apocalyptic number.

40142730 is an abundant number, since it is smaller than the sum of its proper divisors (58021494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40142730 is a wasteful number, since it uses less digits than its factorization.

40142730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25310.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 40142730 is about 6335.8290696640. The cubic root of 40142730 is about 342.4014812456.

Adding to 40142730 its reverse (3724104), we get a palindrome (43866834).

The spelling of 40142730 in words is "forty million, one hundred forty-two thousand, seven hundred thirty".