154399442 has 4 divisors (see below), whose sum is σ = 231599166. Its totient is φ = 77199720.

The previous prime is 154399429. The next prime is 154399447. The reversal of 154399442 is 244993451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244993451 = 347 ⋅706033.

It can be written as a sum of positive squares in only one way, i.e., 152497801 + 1901641 = 12349^2 + 1379^2 .

It is a super-2 number, since 2×154399442² = 47678375379822728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 154399442.

It is not an unprimeable number, because it can be changed into a prime (154399447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38599859 + ... + 38599862.

Almost surely, 2^154399442 is an apocalyptic number.

154399442 is a deficient number, since it is larger than the sum of its proper divisors (77199724).

154399442 is an equidigital number, since it uses as much as digits as its factorization.

154399442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77199723.

The product of its digits is 155520, while the sum is 41.

The square root of 154399442 is about 12425.7572002675. The cubic root of 154399442 is about 536.4738722540.

The spelling of 154399442 in words is "one hundred fifty-four million, three hundred ninety-nine thousand, four hundred forty-two".