123490 has 16 divisors (see below), whose sum is σ = 227448. Its totient is φ = 48256.

The previous prime is 123479. The next prime is 123491. The reversal of 123490 is 94321.

It can be written as a sum of positive squares in 4 ways, for example, as 94249 + 29241 = 307^2 + 171^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (123491) 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, 414 + ... + 646.

2¹²³⁴⁹⁰ is an apocalyptic number.

123490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123490 is a deficient number, since it is larger than the sum of its proper divisors (103958).

123490 is a wasteful number, since it uses less digits than its factorization.

123490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 123490 is about 351.4114397683. The cubic root of 123490 is about 49.7978504795.

The spelling of 123490 in words is "one hundred twenty-three thousand, four hundred ninety".