621403449 has 16 divisors (see below), whose sum is σ = 848582592. Its totient is φ = 404264448.

The previous prime is 621403439. The next prime is 621403469. The reversal of 621403449 is 944304126.

621403449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-621403449 is a prime.

It is a super-2 number, since 2×621403449² = 772284492858191202, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (621403439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255889 + ... + 258305.

It is an arithmetic number, because the mean of its divisors is an integer number (53036412).

Almost surely, 2^621403449 is an apocalyptic number.

It is an amenable number.

621403449 is a deficient number, since it is larger than the sum of its proper divisors (227179143).

621403449 is a wasteful number, since it uses less digits than its factorization.

621403449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4456.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 621403449 is about 24927.9651997511. The cubic root of 621403449 is about 853.3448132645.

The spelling of 621403449 in words is "six hundred twenty-one million, four hundred three thousand, four hundred forty-nine".