145139442 has 64 divisors (see below), whose sum is σ = 351129600. Its totient is φ = 39070080.

The previous prime is 145139441. The next prime is 145139447. The reversal of 145139442 is 244931541.

145139442 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (145139441) 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, 190342 + ... + 191102.

It is an arithmetic number, because the mean of its divisors is an integer number (5486400).

Almost surely, 2^145139442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145139442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175564800).

145139442 is an abundant number, since it is smaller than the sum of its proper divisors (205990158).

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

145139442 is a wasteful number, since it uses less digits than its factorization.

145139442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031.

The product of its digits is 17280, while the sum is 33.

The square root of 145139442 is about 12047.3832013429. The cubic root of 145139442 is about 525.5271403746.

The spelling of 145139442 in words is "one hundred forty-five million, one hundred thirty-nine thousand, four hundred forty-two".