155254742 has 4 divisors (see below), whose sum is σ = 232882116. Its totient is φ = 77627370.

The previous prime is 155254739. The next prime is 155254747. The reversal of 155254742 is 247452551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247452551 = 137 ⋅1806223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155254747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38813684 + ... + 38813687.

It is an arithmetic number, because the mean of its divisors is an integer number (58220529).

Almost surely, 2^155254742 is an apocalyptic number.

155254742 is a deficient number, since it is larger than the sum of its proper divisors (77627374).

155254742 is an equidigital number, since it uses as much as digits as its factorization.

155254742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77627373.

The product of its digits is 56000, while the sum is 35.

The square root of 155254742 is about 12460.1260828292. The cubic root of 155254742 is about 537.4626526782.

The spelling of 155254742 in words is "one hundred fifty-five million, two hundred fifty-four thousand, seven hundred forty-two".