140399666 has 16 divisors (see below), whose sum is σ = 230584320. Its totient is φ = 63584880.

The previous prime is 140399641. The next prime is 140399689. The reversal of 140399666 is 666993041.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5426 + ... + 17613.

It is an arithmetic number, because the mean of its divisors is an integer number (14411520).

Almost surely, 2^140399666 is an apocalyptic number.

140399666 is a deficient number, since it is larger than the sum of its proper divisors (90184654).

140399666 is a wasteful number, since it uses less digits than its factorization.

140399666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23329.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 140399666 is about 11849.0365009143. The cubic root of 140399666 is about 519.7430510620.

The spelling of 140399666 in words is "one hundred forty million, three hundred ninety-nine thousand, six hundred sixty-six".