140402521 has 4 divisors (see below), whose sum is σ = 160460032. Its totient is φ = 120345012.

The previous prime is 140402519. The next prime is 140402527. The reversal of 140402521 is 125204041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125204041 = 37 ⋅3383893.

It is a cyclic number.

It is not a de Polignac number, because 140402521 - 2¹ = 140402519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140402527) 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, 10028745 + ... + 10028758.

It is an arithmetic number, because the mean of its divisors is an integer number (40115008).

Almost surely, 2^140402521 is an apocalyptic number.

It is an amenable number.

140402521 is a deficient number, since it is larger than the sum of its proper divisors (20057511).

140402521 is an equidigital number, since it uses as much as digits as its factorization.

140402521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20057510.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 140402521 is about 11849.1569742324. The cubic root of 140402521 is about 519.7465739962.

Adding to 140402521 its reverse (125204041), we get a palindrome (265606562).

It can be divided in two parts, 14040 and 2521, that added together give a palindrome (16561).

The spelling of 140402521 in words is "one hundred forty million, four hundred two thousand, five hundred twenty-one".