621402 has 8 divisors (see below), whose sum is σ = 1242816. Its totient is φ = 207132.

The previous prime is 621389. The next prime is 621419. The reversal of 621402 is 204126.

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

621402 is an admirable number.

It is a super-2 number, since 2×621402² = 772280891208, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51778 + ... + 51789.

It is an arithmetic number, because the mean of its divisors is an integer number (155352).

2⁶²¹⁴⁰² is an apocalyptic number.

621402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621402 is a wasteful number, since it uses less digits than its factorization.

621402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103572.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 621402 is about 788.2905555695. The cubic root of 621402 is about 85.3344149982.

Adding to 621402 its reverse (204126), we get a palindrome (825528).

The spelling of 621402 in words is "six hundred twenty-one thousand, four hundred two".