140721667 has 4 divisors (see below), whose sum is σ = 143106840. Its totient is φ = 138336496.

The previous prime is 140721653. The next prime is 140721677. The reversal of 140721667 is 766127041.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140721667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140721677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192498 + ... + 1192615.

It is an arithmetic number, because the mean of its divisors is an integer number (35776710).

Almost surely, 2^140721667 is an apocalyptic number.

140721667 is a deficient number, since it is larger than the sum of its proper divisors (2385173).

140721667 is an equidigital number, since it uses as much as digits as its factorization.

140721667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385172.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 140721667 is about 11862.6163640236. The cubic root of 140721667 is about 520.1400843003.

The spelling of 140721667 in words is "one hundred forty million, seven hundred twenty-one thousand, six hundred sixty-seven".