149786021 has 24 divisors (see below), whose sum is σ = 190370880. Its totient is φ = 115346880.

The previous prime is 149785973. The next prime is 149786029. The reversal of 149786021 is 120687941.

It is not a de Polignac number, because 149786021 - 2¹⁴ = 149769637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149786029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74390 + ... + 76376.

It is an arithmetic number, because the mean of its divisors is an integer number (7932120).

Almost surely, 2^149786021 is an apocalyptic number.

149786021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

149786021 is a deficient number, since it is larger than the sum of its proper divisors (40584859).

149786021 is a wasteful number, since it uses less digits than its factorization.

149786021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105 (or 2094 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 149786021 is about 12238.7099401857. The cubic root of 149786021 is about 531.0765125601.

The spelling of 149786021 in words is "one hundred forty-nine million, seven hundred eighty-six thousand, twenty-one".