1239642040 has 384 divisors, whose sum is σ = 3870581760. Its totient is φ = 347922432.

The previous prime is 1239642007. The next prime is 1239642071. The reversal of 1239642040 is 402469321.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1239641993 and 1239642011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18502087 + ... + 18502153.

It is an arithmetic number, because the mean of its divisors is an integer number (10079640).

Almost surely, 2^1239642040 is an apocalyptic number.

1239642040 is a gapful number since it is divisible by the number (10) 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 1239642040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1935290880).

1239642040 is an abundant number, since it is smaller than the sum of its proper divisors (2630939720).

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

1239642040 is a wasteful number, since it uses less digits than its factorization.

1239642040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1239642040 is about 35208.5506659959. The cubic root of 1239642040 is about 1074.2336820886.

The spelling of 1239642040 in words is "one billion, two hundred thirty-nine million, six hundred forty-two thousand, forty".