402140621 has 8 divisors (see below), whose sum is σ = 405627264. Its totient is φ = 398662240.

The previous prime is 402140611. The next prime is 402140639. The reversal of 402140621 is 126041204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402140621 - 2¹⁰ = 402139597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402140593 and 402140602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402140611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131516 + ... + 134538.

It is an arithmetic number, because the mean of its divisors is an integer number (50703408).

Almost surely, 2^402140621 is an apocalyptic number.

It is an amenable number.

402140621 is a deficient number, since it is larger than the sum of its proper divisors (3486643).

402140621 is a wasteful number, since it uses less digits than its factorization.

402140621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131.

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

The square root of 402140621 is about 20053.4441181559. Note that the first 3 decimals coincide. The cubic root of 402140621 is about 738.1183145969.

Adding to 402140621 its reverse (126041204), we get a palindrome (528181825).

The spelling of 402140621 in words is "four hundred two million, one hundred forty thousand, six hundred twenty-one".