621402742 has 8 divisors (see below), whose sum is σ = 934791336. Its totient is φ = 309805632.

The previous prime is 621402731. The next prime is 621402763. The reversal of 621402742 is 247204126.

It is a happy number.

621402742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×621402742² = 772282735530237128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621402742.

It is a congruent number.

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, 447003 + ... + 448390.

It is an arithmetic number, because the mean of its divisors is an integer number (116848917).

Almost surely, 2^621402742 is an apocalyptic number.

621402742 is a deficient number, since it is larger than the sum of its proper divisors (313388594).

621402742 is a wasteful number, since it uses less digits than its factorization.

621402742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895742.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 621402742 is about 24927.9510188864. The cubic root of 621402742 is about 853.3444896341.

Adding to 621402742 its reverse (247204126), we get a palindrome (868606868).

The spelling of 621402742 in words is "six hundred twenty-one million, four hundred two thousand, seven hundred forty-two".