154447042 has 4 divisors (see below), whose sum is σ = 231670566. Its totient is φ = 77223520.

The previous prime is 154447037. The next prime is 154447061. The reversal of 154447042 is 240744451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240744451 = 1049 ⋅229499.

It can be written as a sum of positive squares in only one way, i.e., 153983281 + 463761 = 12409^2 + 681^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 154446995 and 154447013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38611759 + ... + 38611762.

Almost surely, 2^154447042 is an apocalyptic number.

154447042 is a deficient number, since it is larger than the sum of its proper divisors (77223524).

154447042 is an equidigital number, since it uses as much as digits as its factorization.

154447042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77223523.

The product of its (nonzero) digits is 17920, while the sum is 31.

The square root of 154447042 is about 12427.6724288983. The cubic root of 154447042 is about 536.5289966600.

The spelling of 154447042 in words is "one hundred fifty-four million, four hundred forty-seven thousand, forty-two".