149121800 has 24 divisors (see below), whose sum is σ = 346708650. Its totient is φ = 59648640.

The previous prime is 149121793. The next prime is 149121821. The reversal of 149121800 is 8121941.

It can be written as a sum of positive squares in 3 ways, for example, as 123254404 + 25867396 = 11102^2 + 5086^2 .

It is a super-2 number, since 2×149121800² = 44474622470480000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 149121800.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 372605 + ... + 373004.

Almost surely, 2^149121800 is an apocalyptic number.

149121800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

149121800 is an abundant number, since it is smaller than the sum of its proper divisors (197586850).

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

149121800 is a wasteful number, since it uses less digits than its factorization.

149121800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745625 (or 745616 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 149121800 is about 12211.5437189571. The cubic root of 149121800 is about 530.2903357621.

The spelling of 149121800 in words is "one hundred forty-nine million, one hundred twenty-one thousand, eight hundred".