139021920 has 240 divisors, whose sum is σ = 520315488. Its totient is φ = 34836480.

The previous prime is 139021919. The next prime is 139021921. The reversal of 139021920 is 29120931.

It is an interprime number because it is at equal distance from previous prime (139021919) and next prime (139021921).

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139021921) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 220005 + ... + 220635.

Almost surely, 2^139021920 is an apocalyptic number.

139021920 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 139021920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260157744).

139021920 is an abundant number, since it is smaller than the sum of its proper divisors (381293568).

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

139021920 is a wasteful number, since it uses less digits than its factorization.

139021920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 139021920 is about 11790.7557009718. The cubic root of 139021920 is about 518.0373750008.

The spelling of 139021920 in words is "one hundred thirty-nine million, twenty-one thousand, nine hundred twenty".