149561540 has 24 divisors (see below), whose sum is σ = 330610560. Its totient is φ = 56675808.

The previous prime is 149561539. The next prime is 149561549. The reversal of 149561540 is 45165941.

It is a self number, because there is not a number n which added to its sum of digits gives 149561540.

It is not an unprimeable number, because it can be changed into a prime (149561549) 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, 196412 + ... + 197171.

It is an arithmetic number, because the mean of its divisors is an integer number (13775440).

Almost surely, 2^149561540 is an apocalyptic number.

149561540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

149561540 is an abundant number, since it is smaller than the sum of its proper divisors (181049020).

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

149561540 is a wasteful number, since it uses less digits than its factorization.

149561540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393611 (or 393609 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 149561540 is about 12229.5355594560. The cubic root of 149561540 is about 530.8110757029.

The spelling of 149561540 in words is "one hundred forty-nine million, five hundred sixty-one thousand, five hundred forty".