42156154 has 4 divisors (see below), whose sum is σ = 63234234. Its totient is φ = 21078076.

The previous prime is 42156139. The next prime is 42156157. The reversal of 42156154 is 45165124.

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

It can be written as a sum of positive squares in only one way, i.e., 39350529 + 2805625 = 6273^2 + 1675^2 .

It is not an unprimeable number, because it can be changed into a prime (42156157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10539037 + ... + 10539040.

Almost surely, 2^42156154 is an apocalyptic number.

42156154 is a deficient number, since it is larger than the sum of its proper divisors (21078080).

42156154 is a wasteful number, since it uses less digits than its factorization.

42156154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21078079.

The product of its digits is 4800, while the sum is 28.

The square root of 42156154 is about 6492.7770637840. Note that the first 3 decimals coincide. The cubic root of 42156154 is about 348.0329217544.

The spelling of 42156154 in words is "forty-two million, one hundred fifty-six thousand, one hundred fifty-four".