145431442 has 32 divisors (see below), whose sum is σ = 243984384. Its totient is φ = 64584000.

The previous prime is 145431439. The next prime is 145431443. The reversal of 145431442 is 244134541.

It is a self number, because there is not a number n which added to its sum of digits gives 145431442.

It is not an unprimeable number, because it can be changed into a prime (145431443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73567 + ... + 75517.

It is an arithmetic number, because the mean of its divisors is an integer number (7624512).

Almost surely, 2^145431442 is an apocalyptic number.

145431442 is a deficient number, since it is larger than the sum of its proper divisors (98552942).

145431442 is a wasteful number, since it uses less digits than its factorization.

145431442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074.

The product of its digits is 7680, while the sum is 28.

The square root of 145431442 is about 12059.4959264473. The cubic root of 145431442 is about 525.8793330168.

Adding to 145431442 its reverse (244134541), we get a palindrome (389565983).

It can be divided in two parts, 1454 and 31442, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 145431442 in words is "one hundred forty-five million, four hundred thirty-one thousand, four hundred forty-two".