145721943 has 32 divisors (see below), whose sum is σ = 231768000. Its totient is φ = 90160128.

The previous prime is 145721923. The next prime is 145721957. The reversal of 145721943 is 349127541.

It is not a de Polignac number, because 145721943 - 2¹⁰ = 145720919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145721898 and 145721907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145721903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31333 + ... + 35681.

It is an arithmetic number, because the mean of its divisors is an integer number (7242750).

Almost surely, 2^145721943 is an apocalyptic number.

145721943 is a deficient number, since it is larger than the sum of its proper divisors (86046057).

145721943 is a wasteful number, since it uses less digits than its factorization.

145721943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448 (or 4442 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 145721943 is about 12071.5344095107. The cubic root of 145721943 is about 526.2292501640.

The spelling of 145721943 in words is "one hundred forty-five million, seven hundred twenty-one thousand, nine hundred forty-three".