438690 has 32 divisors (see below), whose sum is σ = 1203840. Its totient is φ = 100224.

The previous prime is 438671. The next prime is 438701. The reversal of 438690 is 96834.

It is a super-2 number, since 2×438690² = 384897832200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

438690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 835 + ... + 1254.

It is an arithmetic number, because the mean of its divisors is an integer number (37620).

2⁴³⁸⁶⁹⁰ is an apocalyptic number.

438690 is an abundant number, since it is smaller than the sum of its proper divisors (765150).

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

438690 is a wasteful number, since it uses less digits than its factorization.

438690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 438690 is about 662.3367723447. The cubic root of 438690 is about 75.9834913358.

It can be divided in two parts, 438 and 690, that added together give a triangular number (1128 = T₄₇).

The spelling of 438690 in words is "four hundred thirty-eight thousand, six hundred ninety".