139490 has 32 divisors (see below), whose sum is σ = 287280. Its totient is φ = 48384.

The previous prime is 139487. The next prime is 139493. The reversal of 139490 is 94931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (139487) and next prime (139493).

It can be written as a sum of positive squares in 8 ways, for example, as 66049 + 73441 = 257^2 + 271^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3752 + ... + 3788.

2¹³⁹⁴⁹⁰ is an apocalyptic number.

139490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139490 is an abundant number, since it is smaller than the sum of its proper divisors (147790).

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

139490 is a wasteful number, since it uses less digits than its factorization.

139490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 139490 is about 373.4836007109. The cubic root of 139490 is about 51.8618125863.

The spelling of 139490 in words is "one hundred thirty-nine thousand, four hundred ninety".