1045990 has 32 divisors (see below), whose sum is σ = 2117664. Its totient is φ = 368640.

The previous prime is 1045987. The next prime is 1045997. The reversal of 1045990 is 995401.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045997) 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, 3942 + ... + 4198.

It is an arithmetic number, because the mean of its divisors is an integer number (66177).

2^1045990 is an apocalyptic number.

1045990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1045990 is an abundant number, since it is smaller than the sum of its proper divisors (1071674).

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

1045990 is a wasteful number, since it uses less digits than its factorization.

1045990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1045990 is about 1022.7365252107. The cubic root of 1045990 is about 101.5100817475.

The spelling of 1045990 in words is "one million, forty-five thousand, nine hundred ninety".