149243640 has 256 divisors, whose sum is σ = 561254400. Its totient is φ = 30910464.

The previous prime is 149243623. The next prime is 149243683. The reversal of 149243640 is 46342941.

149243640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 862594 + ... + 862766.

It is an arithmetic number, because the mean of its divisors is an integer number (2192400).

Almost surely, 2^149243640 is an apocalyptic number.

149243640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 149243640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280627200).

149243640 is an abundant number, since it is smaller than the sum of its proper divisors (412010760).

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

149243640 is a wasteful number, since it uses less digits than its factorization.

149243640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 149243640 is about 12216.5314226257. The cubic root of 149243640 is about 530.4347210583.

The spelling of 149243640 in words is "one hundred forty-nine million, two hundred forty-three thousand, six hundred forty".