149891810 has 24 divisors (see below), whose sum is σ = 277319700. Its totient is φ = 58330944.

The previous prime is 149891809. The next prime is 149891813. The reversal of 149891810 is 18198941.

It can be written as a sum of positive squares in 6 ways, for example, as 90801841 + 59089969 = 9529^2 + 7687^2 .

It is a super-2 number, since 2×149891810² = 44935109410152200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (149891813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8216 + ... + 19164.

Almost surely, 2^149891810 is an apocalyptic number.

149891810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

149891810 is a deficient number, since it is larger than the sum of its proper divisors (127427890).

149891810 is a wasteful number, since it uses less digits than its factorization.

149891810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11030 (or 10993 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 149891810 is about 12243.0310789445. The cubic root of 149891810 is about 531.2015104993.

The spelling of 149891810 in words is "one hundred forty-nine million, eight hundred ninety-one thousand, eight hundred ten".