1239425388 has 108 divisors (see below), whose sum is σ = 3298309560. Its totient is φ = 407446848.

The previous prime is 1239425387. The next prime is 1239425393. The reversal of 1239425388 is 8835249321.

1239425388 is a `hidden beast` number, since 1 + 2 + 394 + 253 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (108).

It is not an unprimeable number, because it can be changed into a prime (1239425381) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2177968 + ... + 2178536.

Almost surely, 2^1239425388 is an apocalyptic number.

1239425388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1239425388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1649154780).

1239425388 is an abundant number, since it is smaller than the sum of its proper divisors (2058884172).

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

1239425388 is an frugal number, since it uses more digits than its factorization.

1239425388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 657 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 1239425388 is about 35205.4738357546. The cubic root of 1239425388 is about 1074.1710972381.

The spelling of 1239425388 in words is "one billion, two hundred thirty-nine million, four hundred twenty-five thousand, three hundred eighty-eight".