149661640 has 16 divisors (see below), whose sum is σ = 336738780. Its totient is φ = 59864640.

The previous prime is 149661619. The next prime is 149661641. The reversal of 149661640 is 46166941.

It can be written as a sum of positive squares in 2 ways, for example, as 140138244 + 9523396 = 11838^2 + 3086^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 149661640.

It is not an unprimeable number, because it can be changed into a prime (149661641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1870731 + ... + 1870810.

Almost surely, 2^149661640 is an apocalyptic number.

149661640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

149661640 is an abundant number, since it is smaller than the sum of its proper divisors (187077140).

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

149661640 is a wasteful number, since it uses less digits than its factorization.

149661640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741552 (or 3741548 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 149661640 is about 12233.6274260744. The cubic root of 149661640 is about 530.9294714237.

It can be divided in two parts, 1496 and 61640, that added together give a palindrome (63136).

The spelling of 149661640 in words is "one hundred forty-nine million, six hundred sixty-one thousand, six hundred forty".