148521638 has 4 divisors (see below), whose sum is σ = 222782460. Its totient is φ = 74260818.

The previous prime is 148521631. The next prime is 148521677. The reversal of 148521638 is 836125841.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148521631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37130408 + ... + 37130411.

It is an arithmetic number, because the mean of its divisors is an integer number (55695615).

Almost surely, 2^148521638 is an apocalyptic number.

148521638 is a deficient number, since it is larger than the sum of its proper divisors (74260822).

148521638 is an equidigital number, since it uses as much as digits as its factorization.

148521638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74260821.

The product of its digits is 46080, while the sum is 38.

The square root of 148521638 is about 12186.9453925091. The cubic root of 148521638 is about 529.5779694798.

The spelling of 148521638 in words is "one hundred forty-eight million, five hundred twenty-one thousand, six hundred thirty-eight".