149926781 has 8 divisors (see below), whose sum is σ = 155575200. Its totient is φ = 144310320.

The previous prime is 149926747. The next prime is 149926807. The reversal of 149926781 is 187629941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 149926781 - 2⁶ = 149926717 is a prime.

It is a super-2 number, since 2×149926781² = 44956079322043922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149926741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1790 + ... + 17408.

It is an arithmetic number, because the mean of its divisors is an integer number (19446900).

Almost surely, 2^149926781 is an apocalyptic number.

It is an amenable number.

149926781 is a deficient number, since it is larger than the sum of its proper divisors (5648419).

149926781 is a wasteful number, since it uses less digits than its factorization.

149926781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15979.

The product of its digits is 217728, while the sum is 47.

The square root of 149926781 is about 12244.4591958975. The cubic root of 149926781 is about 531.2428185235.

The spelling of 149926781 in words is "one hundred forty-nine million, nine hundred twenty-six thousand, seven hundred eighty-one".