140904209 has 8 divisors (see below), whose sum is σ = 149233440. Its totient is φ = 132666336.

The previous prime is 140904199. The next prime is 140904221. The reversal of 140904209 is 902409041.

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

It is a cyclic number.

It is not a de Polignac number, because 140904209 - 2²⁴ = 124126993 is a prime.

It is a super-2 number, since 2×140904209² = 39707992227831362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140904229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19652 + ... + 25845.

It is an arithmetic number, because the mean of its divisors is an integer number (18654180).

Almost surely, 2^140904209 is an apocalyptic number.

140904209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

140904209 is a deficient number, since it is larger than the sum of its proper divisors (8329231).

140904209 is a wasteful number, since it uses less digits than its factorization.

140904209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45679.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 140904209 is about 11870.3078730082. The cubic root of 140904209 is about 520.3648930500.

The spelling of 140904209 in words is "one hundred forty million, nine hundred four thousand, two hundred nine".