450139890 has 16 divisors (see below), whose sum is σ = 1080335808. Its totient is φ = 120037296.

The previous prime is 450139853. The next prime is 450139901. The reversal of 450139890 is 98931054.

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, 7502302 + ... + 7502361.

It is an arithmetic number, because the mean of its divisors is an integer number (67520988).

Almost surely, 2^450139890 is an apocalyptic number.

450139890 is an abundant number, since it is smaller than the sum of its proper divisors (630195918).

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

450139890 is a wasteful number, since it uses less digits than its factorization.

450139890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15004673.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 450139890 is about 21216.5004183065. The cubic root of 450139890 is about 766.3888308530.

The spelling of 450139890 in words is "four hundred fifty million, one hundred thirty-nine thousand, eight hundred ninety".