155423647 has 4 divisors (see below), whose sum is σ = 155500416. Its totient is φ = 155346880.

The previous prime is 155423633. The next prime is 155423651. The reversal of 155423647 is 746324551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746324551 = 7 ⋅106617793.

It is a cyclic number.

It is not a de Polignac number, because 155423647 - 2⁷ = 155423519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155423447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35263 + ... + 39424.

It is an arithmetic number, because the mean of its divisors is an integer number (38875104).

Almost surely, 2^155423647 is an apocalyptic number.

155423647 is a deficient number, since it is larger than the sum of its proper divisors (76769).

155423647 is an equidigital number, since it uses as much as digits as its factorization.

155423647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76768.

The product of its digits is 100800, while the sum is 37.

The square root of 155423647 is about 12466.9020610575. The cubic root of 155423647 is about 537.6574877978.

The spelling of 155423647 in words is "one hundred fifty-five million, four hundred twenty-three thousand, six hundred forty-seven".