148639440 has 40 divisors (see below), whose sum is σ = 460783008. Its totient is φ = 39637120.

The previous prime is 148639367. The next prime is 148639441. The reversal of 148639440 is 44936841.

It is a happy number.

148639440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148639441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309426 + ... + 309905.

Almost surely, 2^148639440 is an apocalyptic number.

148639440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

148639440 is an abundant number, since it is smaller than the sum of its proper divisors (312143568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

148639440 is a wasteful number, since it uses less digits than its factorization.

148639440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619347 (or 619341 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 148639440 is about 12191.7775570259. Note that the first 3 decimals coincide. The cubic root of 148639440 is about 529.7179465187.

The spelling of 148639440 in words is "one hundred forty-eight million, six hundred thirty-nine thousand, four hundred forty".