149123640 has 64 divisors (see below), whose sum is σ = 461813760. Its totient is φ = 38482560.

The previous prime is 149123593. The next prime is 149123641. The reversal of 149123640 is 46321941.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 149123598 and 149123607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149123641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16324 + ... + 23763.

It is an arithmetic number, because the mean of its divisors is an integer number (7215840).

Almost surely, 2^149123640 is an apocalyptic number.

149123640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

149123640 is an abundant number, since it is smaller than the sum of its proper divisors (312690120).

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

149123640 is a wasteful number, since it uses less digits than its factorization.

149123640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40132 (or 40128 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 149123640 is about 12211.6190572749. The cubic root of 149123640 is about 530.2925168208.

The spelling of 149123640 in words is "one hundred forty-nine million, one hundred twenty-three thousand, six hundred forty".