99420841 has 15 divisors (see below), whose sum is σ = 109562081. Its totient is φ = 90217608.

The previous prime is 99420833. The next prime is 99420847. The reversal of 99420841 is 14802499.

99420841 = T₇₅ + T₇₆ + ... + T₈₄₁.

It is a happy number.

The square root of 99420841 is 9971.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 49294441 + 50126400 = 7021^2 + 7080^2 .

It is not a de Polignac number, because 99420841 - 2³ = 99420833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99420841.

It is not an unprimeable number, because it can be changed into a prime (99420847) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1685070 + ... + 1685128.

Almost surely, 2^99420841 is an apocalyptic number.

99420841 is the 9971-st square number.

99420841 is the 4986-th centered octagonal number.

It is an amenable number.

99420841 is a deficient number, since it is larger than the sum of its proper divisors (10141240).

99420841 is an frugal number, since it uses more digits than its factorization.

99420841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The cubic root of 99420841 is about 463.2610752294.

Multiplying 99420841 by its product of nonzero digits (20736), we get a square (2061590558976 = 1435824²).

The spelling of 99420841 in words is "ninety-nine million, four hundred twenty thousand, eight hundred forty-one".