140398806 has 8 divisors (see below), whose sum is σ = 280797624. Its totient is φ = 46799600.

The previous prime is 140398799. The next prime is 140398807. The reversal of 140398806 is 608893041.

140398806 = 5923² + 5924² + ... + 5926².

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

140398806 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140398807) 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 3 ways as a sum of consecutive naturals, for example, 11699895 + ... + 11699906.

It is an arithmetic number, because the mean of its divisors is an integer number (35099703).

Almost surely, 2^140398806 is an apocalyptic number.

140398806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

140398806 is a wasteful number, since it uses less digits than its factorization.

140398806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23399806.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 140398806 is about 11849.0002109883. Note that the first 3 decimals coincide. The cubic root of 140398806 is about 519.7419898535.

The spelling of 140398806 in words is "one hundred forty million, three hundred ninety-eight thousand, eight hundred six".