140402621 has 4 divisors (see below), whose sum is σ = 140707644. Its totient is φ = 140097600.

The previous prime is 140402597. The next prime is 140402651. The reversal of 140402621 is 126204041.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48511225 + 91891396 = 6965^2 + 9586^2 .

It is a cyclic number.

It is not a de Polignac number, because 140402621 - 2¹⁴ = 140386237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140402593 and 140402602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140402651) 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, 151820 + ... + 152741.

It is an arithmetic number, because the mean of its divisors is an integer number (35176911).

Almost surely, 2^140402621 is an apocalyptic number.

It is an amenable number.

140402621 is a deficient number, since it is larger than the sum of its proper divisors (305023).

140402621 is an equidigital number, since it uses as much as digits as its factorization.

140402621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305022.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 140402621 is about 11849.1611939411. The cubic root of 140402621 is about 519.7466973905.

Adding to 140402621 its reverse (126204041), we get a palindrome (266606662).

It can be divided in two parts, 14040 and 2621, that added together give a palindrome (16661).

The spelling of 140402621 in words is "one hundred forty million, four hundred two thousand, six hundred twenty-one".