140742921 has 32 divisors (see below), whose sum is σ = 209986560. Its totient is φ = 83131200.

The previous prime is 140742919. The next prime is 140742929. The reversal of 140742921 is 129247041.

It is not a de Polignac number, because 140742921 - 2¹ = 140742919 is a prime.

It is a super-2 number, since 2×140742921² = 39617139623224482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140742929) 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, 279556 + ... + 280058.

It is an arithmetic number, because the mean of its divisors is an integer number (6562080).

Almost surely, 2^140742921 is an apocalyptic number.

140742921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140742921 is a deficient number, since it is larger than the sum of its proper divisors (69243639).

140742921 is a wasteful number, since it uses less digits than its factorization.

140742921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 140742921 is about 11863.5121696739. The cubic root of 140742921 is about 520.1662695615.

Adding to 140742921 its reverse (129247041), we get a palindrome (269989962).

The spelling of 140742921 in words is "one hundred forty million, seven hundred forty-two thousand, nine hundred twenty-one".