145899644 has 24 divisors (see below), whose sum is σ = 294921648. Its totient is φ = 62416640.

The previous prime is 145899631. The next prime is 145899709. The reversal of 145899644 is 446998541.

It is a super-2 number, since 2×145899644² = 42573412238653472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145899592 and 145899601.

It is a congruent number.

It is an unprimeable number.

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, 96779 + ... + 98274.

It is an arithmetic number, because the mean of its divisors is an integer number (12288402).

Almost surely, 2^145899644 is an apocalyptic number.

It is an amenable number.

145899644 is an abundant number, since it is smaller than the sum of its proper divisors (149022004).

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

145899644 is a wasteful number, since it uses less digits than its factorization.

145899644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195085 (or 195083 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 50.

The square root of 145899644 is about 12078.8924989007. The cubic root of 145899644 is about 526.4430671474.

The spelling of 145899644 in words is "one hundred forty-five million, eight hundred ninety-nine thousand, six hundred forty-four".