999423450 has 36 divisors (see below), whose sum is σ = 2685118878. Its totient is φ = 266512800.

The previous prime is 999423437. The next prime is 999423461. The reversal of 999423450 is 54324999.

It is a happy number.

999423450 is a `hidden beast` number, since 99 + 94 + 23 + 450 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 973627209 + 25796241 = 31203^2 + 5079^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 999423396 and 999423405.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1110021 + ... + 1110920.

Almost surely, 2^999423450 is an apocalyptic number.

999423450 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

999423450 is an abundant number, since it is smaller than the sum of its proper divisors (1685695428).

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

999423450 is a wasteful number, since it uses less digits than its factorization.

999423450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220959 (or 2220951 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 999423450 is about 31613.6592314145. The cubic root of 999423450 is about 999.8077797204.

The spelling of 999423450 in words is "nine hundred ninety-nine million, four hundred twenty-three thousand, four hundred fifty".