139401000 has 160 divisors (see below), whose sum is σ = 487567080. Its totient is φ = 37152000.

The previous prime is 139400993. The next prime is 139401007. The reversal of 139401000 is 104931.

It is an interprime number because it is at equal distance from previous prime (139400993) and next prime (139401007).

It can be written as a sum of positive squares in 4 ways, for example, as 57426084 + 81974916 = 7578^2 + 9054^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (139401007) 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, 80140 + ... + 81860.

Almost surely, 2^139401000 is an apocalyptic number.

139401000 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 139401000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243783540).

139401000 is an abundant number, since it is smaller than the sum of its proper divisors (348166080).

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

139401000 is a wasteful number, since it uses less digits than its factorization.

139401000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 139401000 is about 11806.8200629975. The cubic root of 139401000 is about 518.5078029406.

Adding to 139401000 its reverse (104931), we get a palindrome (139505931).

The spelling of 139401000 in words is "one hundred thirty-nine million, four hundred one thousand".