145409854 has 4 divisors (see below), whose sum is σ = 218114784. Its totient is φ = 72704926.

The previous prime is 145409839. The next prime is 145409881. The reversal of 145409854 is 458904541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 458904541 = 1063 ⋅431707.

It is a super-2 number, since 2×145409854² = 42288051280602632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36352462 + ... + 36352465.

It is an arithmetic number, because the mean of its divisors is an integer number (54528696).

Almost surely, 2^145409854 is an apocalyptic number.

145409854 is a deficient number, since it is larger than the sum of its proper divisors (72704930).

145409854 is an equidigital number, since it uses as much as digits as its factorization.

145409854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72704929.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 145409854 is about 12058.6008309422. The cubic root of 145409854 is about 525.8533110308.

The spelling of 145409854 in words is "one hundred forty-five million, four hundred nine thousand, eight hundred fifty-four".