145331990 has 32 divisors (see below), whose sum is σ = 268202880. Its totient is φ = 56674944.

The previous prime is 145331981. The next prime is 145331993. The reversal of 145331990 is 99133541.

It is a super-2 number, since 2×145331990² = 42242774634720200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145331990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145331993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174896 + ... + 175724.

It is an arithmetic number, because the mean of its divisors is an integer number (8381340).

Almost surely, 2^145331990 is an apocalyptic number.

145331990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145331990 is a deficient number, since it is larger than the sum of its proper divisors (122870890).

145331990 is a wasteful number, since it uses less digits than its factorization.

145331990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 145331990 is about 12055.3718316774. The cubic root of 145331990 is about 525.7594330446.

The spelling of 145331990 in words is "one hundred forty-five million, three hundred thirty-one thousand, nine hundred ninety".