140721945 has 32 divisors (see below), whose sum is σ = 277116672. Its totient is φ = 59380992.

The previous prime is 140721941. The next prime is 140721979. The reversal of 140721945 is 549127041.

It is a happy number.

140721945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 140721945 - 2² = 140721941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140721941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50182 + ... + 52911.

It is an arithmetic number, because the mean of its divisors is an integer number (8659896).

Almost surely, 2^140721945 is an apocalyptic number.

140721945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

140721945 is a deficient number, since it is larger than the sum of its proper divisors (136394727).

140721945 is a wasteful number, since it uses less digits than its factorization.

140721945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103121.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 140721945 is about 11862.6280815003. The cubic root of 140721945 is about 520.1404268177.

Adding to 140721945 its reverse (549127041), we get a palindrome (689848986).

The spelling of 140721945 in words is "one hundred forty million, seven hundred twenty-one thousand, nine hundred forty-five".