140402181 has 8 divisors (see below), whose sum is σ = 191556640. Its totient is φ = 91424592.

The previous prime is 140402177. The next prime is 140402203. The reversal of 140402181 is 181204041.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 140402181 - 2² = 140402177 is a prime.

It is a super-2 number, since 2×140402181² = 39425544859113522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140402681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544066 + ... + 544323.

It is an arithmetic number, because the mean of its divisors is an integer number (23944580).

Almost surely, 2^140402181 is an apocalyptic number.

It is an amenable number.

140402181 is a deficient number, since it is larger than the sum of its proper divisors (51154459).

140402181 is a wasteful number, since it uses less digits than its factorization.

140402181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088435.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 140402181 is about 11849.1426272115. The cubic root of 140402181 is about 519.7461544548.

The spelling of 140402181 in words is "one hundred forty million, four hundred two thousand, one hundred eighty-one".