149189840 has 20 divisors (see below), whose sum is σ = 346866564. Its totient is φ = 59675904.

The previous prime is 149189801. The next prime is 149189861. The reversal of 149189840 is 48981941.

It can be written as a sum of positive squares in 2 ways, for example, as 65869456 + 83320384 = 8116^2 + 9128^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 149189791 and 149189800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932357 + ... + 932516.

Almost surely, 2^149189840 is an apocalyptic number.

149189840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

149189840 is an abundant number, since it is smaller than the sum of its proper divisors (197676724).

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

149189840 is a wasteful number, since it uses less digits than its factorization.

149189840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864886 (or 1864880 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 149189840 is about 12214.3292898137. The cubic root of 149189840 is about 530.3709755886.

The spelling of 149189840 in words is "one hundred forty-nine million, one hundred eighty-nine thousand, eight hundred forty".