149209878 has 16 divisors (see below), whose sum is σ = 311394816. Its totient is φ = 47574120.

The previous prime is 149209877. The next prime is 149209903. The reversal of 149209878 is 878902941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149209873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540478 + ... + 540753.

It is an arithmetic number, because the mean of its divisors is an integer number (19462176).

Almost surely, 2^149209878 is an apocalyptic number.

149209878 is an abundant number, since it is smaller than the sum of its proper divisors (162184938).

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

149209878 is a wasteful number, since it uses less digits than its factorization.

149209878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081259.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 149209878 is about 12215.1495283521. The cubic root of 149209878 is about 530.3947196046.

The spelling of 149209878 in words is "one hundred forty-nine million, two hundred nine thousand, eight hundred seventy-eight".