138962640 has 40 divisors (see below), whose sum is σ = 430784928. Its totient is φ = 37056640.

The previous prime is 138962633. The next prime is 138962647. The reversal of 138962640 is 46269831.

It is an interprime number because it is at equal distance from previous prime (138962633) and next prime (138962647).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138962647) 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, 289266 + ... + 289745.

Almost surely, 2^138962640 is an apocalyptic number.

138962640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138962640 is an abundant number, since it is smaller than the sum of its proper divisors (291822288).

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

138962640 is a wasteful number, since it uses less digits than its factorization.

138962640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579027 (or 579021 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 138962640 is about 11788.2415991529. The cubic root of 138962640 is about 517.9637328454.

The spelling of 138962640 in words is "one hundred thirty-eight million, nine hundred sixty-two thousand, six hundred forty".