431990 has 16 divisors (see below), whose sum is σ = 837648. Its totient is φ = 159456.

The previous prime is 431983. The next prime is 431993. The reversal of 431990 is 99134.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431993) 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, 1532 + ... + 1791.

It is an arithmetic number, because the mean of its divisors is an integer number (52353).

2⁴³¹⁹⁹⁰ is an apocalyptic number.

431990 is a deficient number, since it is larger than the sum of its proper divisors (405658).

431990 is a wasteful number, since it uses less digits than its factorization.

431990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343.

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

The square root of 431990 is about 657.2594617044. The cubic root of 431990 is about 75.5946796924.

The spelling of 431990 in words is "four hundred thirty-one thousand, nine hundred ninety".