1240090 has 16 divisors (see below), whose sum is σ = 2245320. Its totient is φ = 493120.

The previous prime is 1240087. The next prime is 1240097. The reversal of 1240090 is 900421.

It can be written as a sum of positive squares in 4 ways, for example, as 579121 + 660969 = 761^2 + 813^2 .

It is an Ulam number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1240097) 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, 2460 + ... + 2920.

2^1240090 is an apocalyptic number.

1240090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1240090 is a deficient number, since it is larger than the sum of its proper divisors (1005230).

1240090 is a wasteful number, since it uses less digits than its factorization.

1240090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1240090 is about 1113.5932830257. The cubic root of 1240090 is about 107.4363062386.

The spelling of 1240090 in words is "one million, two hundred forty thousand, ninety".