145149990 has 16 divisors (see below), whose sum is σ = 348360048. Its totient is φ = 38706656.

The previous prime is 145149973. The next prime is 145149997. The reversal of 145149990 is 99941541.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145149997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2419137 + ... + 2419196.

It is an arithmetic number, because the mean of its divisors is an integer number (21772503).

Almost surely, 2^145149990 is an apocalyptic number.

145149990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145149990 is an abundant number, since it is smaller than the sum of its proper divisors (203210058).

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

145149990 is a wasteful number, since it uses less digits than its factorization.

145149990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4838343.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 145149990 is about 12047.8209648052. The cubic root of 145149990 is about 525.5398709504.

The spelling of 145149990 in words is "one hundred forty-five million, one hundred forty-nine thousand, nine hundred ninety".