450399138 has 16 divisors (see below), whose sum is σ = 1029483840. Its totient is φ = 128685456.

The previous prime is 450399119. The next prime is 450399163. The reversal of 450399138 is 831993054.

It is a super-2 number, since 2×450399138² = 405718767022286088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 10723789 = 450399138 / (4 + 5 + 0 + 3 + 9 + 9 + 1 + 3 + 8).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 450399138.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5361853 + ... + 5361936.

It is an arithmetic number, because the mean of its divisors is an integer number (64342740).

Almost surely, 2^450399138 is an apocalyptic number.

450399138 is an abundant number, since it is smaller than the sum of its proper divisors (579084702).

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

450399138 is a wasteful number, since it uses less digits than its factorization.

450399138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10723801.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 450399138 is about 21222.6091232911. The cubic root of 450399138 is about 766.5359307846.

The spelling of 450399138 in words is "four hundred fifty million, three hundred ninety-nine thousand, one hundred thirty-eight".