40102142 has 4 divisors (see below), whose sum is σ = 60153216. Its totient is φ = 20051070.

The previous prime is 40102109. The next prime is 40102147. The reversal of 40102142 is 24120104.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40102147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025534 + ... + 10025537.

It is an arithmetic number, because the mean of its divisors is an integer number (15038304).

Almost surely, 2^40102142 is an apocalyptic number.

40102142 is a deficient number, since it is larger than the sum of its proper divisors (20051074).

40102142 is a wasteful number, since it uses less digits than its factorization.

40102142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20051073.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 40102142 is about 6332.6252060263. The cubic root of 40102142 is about 342.2860425115.

Adding to 40102142 its reverse (24120104), we get a palindrome (64222246).

The spelling of 40102142 in words is "forty million, one hundred two thousand, one hundred forty-two".