145721812 has 6 divisors (see below), whose sum is σ = 255013178. Its totient is φ = 72860904.

The previous prime is 145721789. The next prime is 145721819. The reversal of 145721812 is 218127541.

145721812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 129367876 + 16353936 = 11374^2 + 4044^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145721819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18215223 + ... + 18215230.

Almost surely, 2^145721812 is an apocalyptic number.

It is an amenable number.

145721812 is a deficient number, since it is larger than the sum of its proper divisors (109291366).

145721812 is a wasteful number, since it uses less digits than its factorization.

145721812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36430457 (or 36430455 counting only the distinct ones).

The product of its digits is 4480, while the sum is 31.

The square root of 145721812 is about 12071.5289835215. The cubic root of 145721812 is about 526.2290924755.

It can be divided in two parts, 14572 and 1812, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 145721812 in words is "one hundred forty-five million, seven hundred twenty-one thousand, eight hundred twelve".