145991646 has 20 divisors (see below), whose sum is σ = 327129792. Its totient is φ = 48663828.

The previous prime is 145991641. The next prime is 145991647. The reversal of 145991646 is 646199541.

It is a happy number.

145991646 is a `hidden beast` number, since 1 + 4 + 599 + 16 + 46 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145991641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 450430 + ... + 450753.

Almost surely, 2^145991646 is an apocalyptic number.

145991646 is an abundant number, since it is smaller than the sum of its proper divisors (181138146).

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

145991646 is an equidigital number, since it uses as much as digits as its factorization.

145991646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901197 (or 901188 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 145991646 is about 12082.7002776697. The cubic root of 145991646 is about 526.5536994441.

The spelling of 145991646 in words is "one hundred forty-five million, nine hundred ninety-one thousand, six hundred forty-six".