153978623 has 4 divisors (see below), whose sum is σ = 156147408. Its totient is φ = 151809840.

The previous prime is 153978619. The next prime is 153978631. The reversal of 153978623 is 326879351.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 153978623 - 2² = 153978619 is a prime.

It is a super-2 number, since 2×153978623² = 47418832681952258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153978683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084286 + ... + 1084427.

It is an arithmetic number, because the mean of its divisors is an integer number (39036852).

Almost surely, 2^153978623 is an apocalyptic number.

153978623 is a deficient number, since it is larger than the sum of its proper divisors (2168785).

153978623 is an equidigital number, since it uses as much as digits as its factorization.

153978623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168784.

The product of its digits is 272160, while the sum is 44.

The square root of 153978623 is about 12408.8123122239. The cubic root of 153978623 is about 535.9860384256.

The spelling of 153978623 in words is "one hundred fifty-three million, nine hundred seventy-eight thousand, six hundred twenty-three".