149439940 has 96 divisors (see below), whose sum is σ = 359856000. Its totient is φ = 51981696.

The previous prime is 149439937. The next prime is 149439943. The reversal of 149439940 is 49934941.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (149439937) and next prime (149439943).

It is not an unprimeable number, because it can be changed into a prime (149439943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 834771 + ... + 834949.

It is an arithmetic number, because the mean of its divisors is an integer number (3748500).

Almost surely, 2^149439940 is an apocalyptic number.

149439940 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 149439940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179928000).

149439940 is an abundant number, since it is smaller than the sum of its proper divisors (210416060).

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

149439940 is a wasteful number, since it uses less digits than its factorization.

149439940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 149439940 is about 12224.5629778737. The cubic root of 149439940 is about 530.6671792444.

The spelling of 149439940 in words is "one hundred forty-nine million, four hundred thirty-nine thousand, nine hundred forty".